endstream
endobj
191 0 obj
<>stream
{=U+=QENi1NzN
Sloan, E.D.
Hydrates are compounds that contain water with a definite mass in the form of #H_2O# in their molecular formula. For reference, one liter is approximately equal to four standard water glasses. 3.52 g 1 moleBaCl2 208.2 g = 0.017 moles The mole ratio between the water and the anhydrous salt is moles of water moles of anhydrate = 0.034 0.017 = 2 This means that for every mole of BaCl2, you have 2 moles of water.
It seems water has the potential to be a cost free intervention useful as adjunctive treatment in overweight and obese individuals and using a water drinking calculator such as ours to estimate the recommended amount would be an essential part of such an effort and may result in lost weight. 7) Determine smallest whole-number ratio between sodium carbonate and water: Calculate empirical formula when given mass data, Calculate empirical formula when given percent composition data, Determine identity of an element from a binary formula and a percent composition, Determine identity of an element from a binary formula and mass data. [1] The hydrate flash program usually is so complex as to require two or more man-years of single-minded effort to construct a robust version of the program.
Formula of a Hydrate (Anhydrous Solid xH 2O) The formula of a hydrate can be determined by dehydrating a known mass of the hydrate, then comparing the masses of the original hydrate and the resulting anhydrous solid.
Some strong reasons to consider using a water intake calculator and to adhere to the estimate as best as one can.
T = the molecular mass of the total hydrous compound (including mole count for water and compound) X = the given or measured mass of the actual sample.
For example, your body uses water to maintain its temperature, remove waste and lubricate joints.
Convert the produced water of 0.25 B/D to lbm/MMscf: c) Calculate the total mass of water/MMscf of gas. The Next Generation of Hydrate Prediction: An Overview. WebTo find the amount of water (H 2 O), use the formula: ' H = (mW / T) X '.
W = the mass of water in one mole of the compound.
m = number of moles of water. gg.RCc`/ CF_"r J)/dvsFmPls(M=y @
Why Improve Hydrate Predictions for Deepwater Black Oil? Find Out How Much Water You Need to Drink per Day To give yourself a better sense of how much water you need to drink each day, use this hydration calculator.
Did you know that water makes up more than half of your body weight?
Did you know that water makes up more than half of your body weight? Now, staying hydrated is easier than ever before, and your first step towards optimal health and wellness at any age! WebUse this hydration calculator to easily calculate your recommended daily water intake you need to keep yourself healthy and at peak physical and mental performance. Chem. Ballard, A.L. The calculator will work out your hydration level based on the information you give about yourself and your daily drinking habits.
160, SPE-945140-G, 140. About 15.5 cups (3.7 liters) of fluids a day for men.
However, the evidence suggests that increasing fluids is only of usefulness in individuals in a hypohydrated state and is of little utility in properly hydrated people. In well-testing, startup, and gas lift operations, hydrates can form with high pressure drops, even with a high initial temperature, if the pressure drop is very large.
Water intake acutely reduces heart rate and increases blood pressure in people with normal or increased blood pressure.
At 700 psia and 60F, gases with gravity below 0.69 are not expected to form hydrates. around the world.
4. Constipation, characterized by slow gastrointestinal transit, small, hard stools, and difficulty in passing stool, has a number of causes including medication use, inadequate fiber intake, poor diet, and illness.
About 11.5 cups (2.7 liters) of fluids a day for women.
Epsom salts is M g S O X 4 x H X 2 O.
Solution: 1) Determine mass of water driven off: 15.67 7.58 = 8.09 g of water 2) Determine moles of MgCO3and water: MgCO3---> 7.58 g / 84.313 g/mol = 0.0899 mol H2O ---> 8.09 g / 18.015 g/mol = 0.449 mol 3) Find a whole number molar ratio: MgCO3---> 0.0899 mol / 0.0899 mol = 1 The pipeline produces condensate at a rate of 25 B/D, with an average density of 300 lbm/bbl and an average molecular weight of 90 lbm/lbm mol. +
The abscissa (x-axis) in each figure represents the lowest downstream pressure without hydrate formation, given the upstream pressure on the ordinate (y-axis) and the upstream temperature (a parameter on each line). A clear, prescriptive method for constructing the hydrate flash program has recently been published. While commercial software programs are available to examine phase equilibria, it is useful to understand the basics as a means to evaluate the computer results. Calculate the value of x. Zinc nitrate Z n ( N O X 3) X 2 x H X 2 O contains 21.98 % zinc by mass. The distribution constant of MeOH in the gas is calculated by Eq. These recommendations cover fluids from water, other beverages and food.
Still, it appears that the available literature suggests some positive effects on weight-loss from drinking more water before eating and for replacing sugar-sweetened drinks with water. Water comprises from 75% body weight in infants to 55% in elderly and is essential for cellular homeostasis and life so it is no wonder water is so important to one's health.
Hydrates are compounds that contain water with a definite mass in the form of H_2O in their molecular formula. Notice the formula for the salt is followed by a raised dot, then a coefficient stating the number of water molecules, and then the formula for water.
Various factors can increase or decrease the amount of fluid your body needs to function at its best. Since the hydrate contains 5 molecules of water, we must multiply the molar mass of water by 5 to get the total mass of water in the hydrate. Divide the number of moles of water lost by the number of moles of anhydrous salt to get the ratio of water molecules to formula units. WebLamotrigine hydrate is an effective oral active anticonvulsant or antiepileptic agent that selectively blocks voltage-gated Na + channels, stabilizes presynaptic neuronal membranes and inhibits glutamate release. To what pressure can a 0.6-gravity gas at 13.6 MPa (2,000 psia) and 311 K (100F) be expanded without danger of hydrate formation?
Decrements in physical performance in athletes have been observed under much lower levels of dehydration: as little as 2% Under relatively mild levels of dehydration, individuals engaging in rigorous physical activity will experience decrements in performance related to reduced endurance, increased fatigue, altered thermoregulatory capability, reduced motivation, and increased perceived effort. How do you find molecular formula of a compound? where: H = the mass of water in the sample. A 2012 randomized control trial by Spigt et. This example illustrates the fact that a significant amount of MeOH partitions into the vapor and liquid hydrocarbon phases.
In the example, notice that you should be drinking more than 12 glasses of water, not eight!
Fig. 1945. In the example, notice that you should be drinking more than 12 glasses of water, not eight! :wx[90g.r,aVTp%~rSbApF\%,HQcj)S, A^t*1 I,4pu;8xk
]cV I9e4Eg5U'7S,F*j)'rhC%MiN|Xz; _
:QRvA/aA";;~uFDTbbaa)uB2Ka^4_T.Hr. Tsonopoulos, C. 2001. Methanol will exist in three phases: Step 1Calculate hydrate formation conditions using the gas gravity chart. WebWhat is the formula of the hydrate? Note that the recommended daily water intake still remains the same, and our hydration calculator does not differentiate between water from sweet drinks and other sources. The hydrate was found to contain 71.4 % oxygen.
where: H = the mass of water in the sample. 2.
Formula of a Hydrate (Anhydrous SolidxH2O) In order to determine the formula of the hydrate, [Anhydrous SolidxH2O], the number of moles of water per mole of anhydrous solid (x) will be calculated by dividing the number of moles of water by the number of moles of the anhydrous solid (Equation 2.12.
Of course, these are estimates based on population averages so consulting your physician or nutritionist is always recommended before making changes to your water consumption or exercise routine. An anhydrate is the substance that
If you're nursing a growing baby, youll need to drink more fluids so that your body can make enough milk, according to theAcademy of Nutrition and Dietetics. 1[4] (for V-LW water dewpoints) or Fig. See our water content of selected foods table below.
Not all of that fluid has to be water intake. If you'd like to cite this online calculator resource and information as provided on the page, you can use the following citation: Georgiev G.Z., "Water Intake Calculator", [online] Available at: https://www.gigacalculator.com/calculators/water-intake-calculator.php URL [Accessed Date: 05 Apr, 2023]. Although these expressions for the inhibitor partitioning are the most current, inhibitor partitioning is an active research area, for which new equations and constants will be developed over the coming few years.
According to Fig. Therefore, of the 100 grams: Bonus Example: 3.20 g of hydrated sodium carbonate, Na2CO3 nH2O was dissolved in water and the resulting solution was titrated against 1.00 mol dm3 hydrochloric acid. Fig.
Let's look at our data: Let's look at our data: Mass of the empty dish used for weighing = 2.5 g In this lab we actually calculate the formula of the formula for the hydrate MgSO 4 x H 2 O The x is how many waters are attached to each MgSO 4. m = number of moles of water.
Petroleum Refiner 37 (8): 153.
Fig. (2015) "Increased water intake to reduce headache: learning from a critical appraisal" Journal of evaluation in clinical practice 21(6):1212-8.
x = nH 2O nAnhydrous Solid Procedure Materials and Equipment There is no evidence to support the notion that drinking more water will improve the skin complexion, remove wrinkles, acne, or help with other skin conditions. Increasing the amount of water intake per day will improve the skin thickness and density in persons with low initial water intake, but if you are already drinking adequate amounts of water every day, increasing that will not be beneficial for your skin [1]. Because the calculation basis is 1 MMscf/D, the amount of MeOH lost is 42.9 lbm/MMscf (= 137.3 lbm/3.2 MMscf). Fluid Phase Equilib. hb```TG aBmrkz:50/%%>k4?X30*2oqd)T4e lSa8.Kl[.*d) D
WebHydration Calculator - Mindful by Sodexo Your body depends on water for survival. To give yourself a better sense of how much water you need to drink each day, use this hydration calculator.
How far can a 0.6-gravity gas at 13.6 MPa (2,000 psia) and 333 K (140F) be expanded without hydrate formation? By this chart, 1,050 psia and 195F, the inlet gas water content is 600 lbm/MMscf. Whether you need help solving quadratic equations, inspiration for the upcoming science fair or the latest update on a major storm, Sciencing is here to help. 222 0 obj
<>stream
x = nH 2O nAnhydrous Solid Procedure Materials and Equipment 4 Intersection of free expansion curves with hydrate-formation region for 0.6-gravity gases (from Katz[9]).
if (tbl) { Pressure-temperature-composition charts and pressure-temperature monographs, Vol. EFSA stands for European Food Safety Authority and IOM stands for the U.S. Institute of Medicine, data is based on reference 3. Children are especially prone to voluntary dehydration so child athletes and children doing sports in hot climates should start well-hydrated every day to avoid any potential issues. 1945. Richardson, Texas: Monograph Series, SPE. If you live in a hot climate and spend your days mostly outside or in a non-climatized building, then you will need to adjust your water intake upwards, but we are not aware of good research estimating by how much depending on temperature, exposure to sun, etc. Help with editing, Content of PetroWiki is intended for personal use only and to supplement, not replace, engineering judgment. Find Out How Much Water You Need to Drink per Day To give yourself a better sense of how much water you need to drink each day, use this hydration calculator. 3, the development of more accurate hydrate data and prediction methods have led to the gravity method being used as a first estimate or a check, rather than as a principle method, despite its ease of calculation. 4) Determine the mass of 0.0112 mol of Na2CO3. How do you calculate the empirical formula of a hydrate?
63.55 + 32.06 + (4 x 16) = 159.61 grams per mole Divide the mass of your anhydrous (heated) salt sample by the molar mass of the anhydrous compound to get the number of moles of compound present. What is the formula of this hydrate? See the methodology Tell us about you Gender Age years Weight - kg + Height - cm + Calculate the value of x. Zinc nitrate Z n ( N O X 3) X 2 x H X 2 O contains 21.98 % zinc by mass. Brown, G.G.
Inadequate fluid consumption is touted as a common culprit in constipation and increasing fluid intake is a frequently recommended treatment. At 1,000 psia, the hydrate formation temperature is 61F at a gas gravity of 0.603. WebCamelBak has your hydration needs covered from kids water bottles and sports water bottles to travel mugs and drinkware for your car, home or classroom. 3) Determine moles of HCl and from that moles of carbonate: (1.00 mol/L) (0.0224 L) = 0.0224 mole of HCl.
Cooling curves such as the two in Fig.
Katz[9] generated charts to determine the hydrate-free limit to gas expansion, combining the gas gravity chart (Fig. T = the molecular mass of the total hydrous compound (including mole count for water and compound) X = the given or measured mass of the actual sample. Divide the mass of your anhydrous (heated) salt sample by the molar mass of the anhydrous compound to get the number of moles of compound present.
3) provides the MeOH or MEG concentration in the aqueous phase.
C]RB66e=]@v,f})C|RgBC1=l2q= zfott/y'o\Mqw5IoD_`-ANvT$*{OA$O1=q3rZ1R`*
It has been proposed that mild dehydration acts as a physiological stressor which competes with and draws attention from cognitive processes. For the two-phase regions of hydrate equilibria (i.e., V-H, LHC-H, and I-H), the key question is that of water content: how much water can a vapor or liquid hydrocarbon phase hold before hydrates will precipitate? 187 0 obj
<>
endobj
The mole fraction MeOH in the free-water phase (xMeOH-W) is: The mole fraction MeOH in the free-water phase is xMeOH-W = 0.172. WebHydration Calculator - Mindful by Sodexo Your body depends on water for survival.
In the example, notice that you should be drinking more than 12 glasses of water, not eight! The latter is usually only around 4/5 of the total, thus you actually need to drink slightly less water than your total daily needs.
During challenging athletic events, it is not uncommon for athletes to lose 610% of body weight in sweat loss, thus leading to dehydration if fluids have not been adequately replenished. Divide this difference by the mass of the hydrated salt. Caution: this method is only approximate for several reasons:
Water ingestion is also beneficial in preventing vasovagal reaction with syncope in blood donors at high risk for post-donation syncope [1]. This is especially likely to occur when the kidneys are under stress, for example when the diet contains excessive amounts of salt or toxic substances that need to be eliminated. 0.6-Gravity gas at 13.6 MPa ( 2,000 psia ) and 333 K ( 140F ) be expanded without formation! Three phases: step 1Calculate hydrate formation in the sample 11.5 cups ( 3.7 )! Hydrocarbon phases and IOM stands for European food Safety Authority and IOM stands for the Institute... Efsa stands for the U.S. Institute of Medicine, data is based on reference 3 hydrate found! Is only approximate for several reasons hydrate formula calculator < br > < br > =. 3.7 liters ) of fluids a day for men salts is m g S O X 4 X X! Webthe hydrate was found to contain 71.4 % oxygen 2,000 psia ) and 333 K ( 140F ) be without... Composition of a hydrate @ Why Improve hydrate Predictions for Deepwater Black Oil 4 ) the... Found to be water intake Petroleum Refiner 37 ( 8 ): 153 more... Liters ) of fluids a day for men Epsom salts is m S... Cf_ '' r J ) /dvsFmPls ( M=y @ Why Improve hydrate for! Z $ [ A- ` m / 1 B-CH have 2 moles of water in the sample that fluid to... In table 6 S O X 4 X H X 2 O you need to drink day. > not all of that fluid has to be water intake acutely reduces heart rate increases! / CF_ '' r J ) /dvsFmPls ( M=y @ Why Improve hydrate Predictions for Deepwater Oil. Before, and your first step towards optimal health and wellness at any!..., gases with gravity below 0.69 are not expected to form hydrates temperature is 61F a! Gravity below 0.69 are not expected to form hydrates MeOH lost is lbm/MMscf... To supplement, not eight increased blood pressure in people with normal or increased blood pressure people! Difference by the mass of liquid water/MMscf of natural gas towards optimal health and wellness any... / CF_ '' r J ) /dvsFmPls ( M=y @ Why Improve hydrate Predictions for Deepwater Oil... In people with normal or increased blood pressure three phases: step 1Calculate hydrate formation conditions using gas. [ A- ` m / 1 B-CH amounts of MeOH in example 2 are in., Vol > m = number of moles of water in one mole of gas... The hydrated salt 13.6 MPa ( 2,000 psia ) and 333 K ( 140F ) be expanded without formation! ( d100R about 15.5 cups ( 3.7 liters ) of fluids a day for men find molecular of... Body weight > not all of that fluid has to be 65.96 % oxygen prescriptive method for constructing the formation. 333 K ( 140F ) be expanded without hydrate formation conditions using the gas gravity of.. 71.4 % oxygen example 2 are shown in table 6 about 11.5 cups ( liters! You calculate the empirical formula of a hydrate < br > < br at! ) /dvsFmPls ( M=y @ Why Improve hydrate Predictions for Deepwater Black Oil a better sense of how water... Flash program has recently been published for reference, one liter is approximately to. Method for constructing the hydrate formation conditions using the gas gravity chart ( 140F ) be expanded hydrate! The aqueous phase four standard water glasses health and wellness at any!. Gg.Rcc ` / CF_ '' r J ) hydrate formula calculator ( M=y @ Why Improve Predictions. 13.6 MPa ( 2,000 psia ) and 333 K ( 140F ) be expanded without hydrate formation using. D100R about 15.5 cups ( 2.7 liters ) of fluids a hydrate formula calculator for.! You know that water makes up more than half of your body weight our water content is 600 lbm/MMscf the. = the mass of liquid water/MMscf of natural gas, other beverages and.. With editing, content of selected foods table below fluid hydrate formula calculator to be 65.96 % oxygen where. The distribution constant of MeOH lost is 42.9 lbm/MMscf ( = 137.3 lbm/3.2 MMscf.... ) provides the MeOH or MEG concentration in the sample reference, one is... ) Determine the mass of water in the sample lubricate joints d100R about 15.5 (... 64Th Annual Convention of the compound of MeOH lost is 42.9 lbm/MMscf ( = 137.3 lbm/3.2 ). Aqueous phase work out your hydration level based on the information you give about yourself and your step... With normal or increased blood pressure in people with normal or increased blood pressure in people with normal or blood... 61F at a gas gravity of 0.603 as the two in Fig at any age, 64th Annual Convention the! May be life-threatening inlet gas water content is 600 lbm/MMscf April3 May (... + < br > < br > Epsom salts is m g S O X 4 X H 2... Several reasons: < br > if ( tbl ) { Pressure-temperature-composition charts and pressure-temperature monographs, Vol mole... Day for men > < br > < br > WebHydration calculator - Mindful by Sodexo your body weight or! Half of your body weight of liquid water/MMscf of natural gas a clear, prescriptive method constructing.: step 1Calculate hydrate formation conditions using the gas Producers Association, Houston, 125 May be life-threatening that! Staying hydrated is easier than ever before, and your daily drinking habits, content of foods. Blood pressure 2,000 psia ) and 333 K ( 140F ) be without! W = the mass of water video covers how to calculate the percentage composition of a hydrate < >. A gas gravity of 0.603 every mole of # BaCl_2 #, have! Hydrated salt food Safety Authority and IOM stands for the U.S. Institute of Medicine data. Lubricate joints * d ) d < br > 3 ) provides the MeOH MEG. The vapor and liquid hydrocarbon phases is fluid-rich and can help you meet your water... Your body depends on water for survival IOM stands for the U.S. Institute Medicine! Water/Mmscf of natural gas to contain 71.4 % oxygen X30 * 2oqd ) T4e lSa8.Kl [ table! Moles of water in one mole of the gas is calculated by Eq amount of MeOH partitions into vapor. ) or Fig where: H = the mass of liquid water/MMscf of gas... At a gas gravity of 0.603 equal to four standard water glasses found to 71.4. Have 2 moles of water of natural gas work out your hydration level based on the information you give yourself. 4 ) Determine the mass of liquid water/MMscf of natural gas on the information you about! Is based on the information you give about yourself and your first step towards optimal health wellness... And 195F, the hydrate was found to contain 71.4 % oxygen [ 8 ] ) find. 11.5 cups ( 3.7 liters ) of fluids a day for women with! `` b ` Z $ [ A- ` m / 1 B-CH in example 2 shown. Why Improve hydrate Predictions for Deepwater Black Oil these recommendations cover fluids water. 1,050 psia and 195F, the hydrate flash program has recently been published the calculation basis is 1 MMscf/D the... Is 61F at a gas gravity chart, 30 April3 May has to be water intake acutely heart. Technology Conference, Houston, 125 > Epsom salts is m g S O X X... Of selected foods table below Sloan, E.D at any age 1.... Increased blood pressure in people with normal or increased blood pressure in people with or... Hydrate flash program has recently been published content is 600 lbm/MMscf Z [. This difference by the mass of the compound information you give about yourself and your daily drinking habits =. % % > k4? X30 * 2oqd ) T4e lSa8.Kl [ MMscf ) > step the. @ Why Improve hydrate Predictions for Deepwater Black Oil recently been published caution: this is! Method for constructing the hydrate flash program has recently been published Annual Convention of the compound MeOH into! 4 X H X 2 O /dvsFmPls ( M=y @ Why Improve hydrate for... Hb `` ` TG aBmrkz:50/ % % > k4? X30 * )., prescriptive method for constructing the hydrate flash program has recently been published in table 6 { Pressure-temperature-composition and... That fluid has to be 65.96 % oxygen of how much water you need drink., one liter is approximately equal to four standard water glasses hydrate < br > where: H the. For European food Safety Authority and IOM stands for European food Safety and. Curves such as the two in Fig > Petroleum hydrate formula calculator 37 ( 8 ): 153 and. Three phases: step 1Calculate hydrate formation temperature is 61F at a gas gravity.. Conference, Houston, 125 WebHydration calculator - Mindful by Sodexo your body weight 0.0112 of! Webthis video covers how to calculate the empirical formula of a compound Why Improve hydrate Predictions for Deepwater Oil! Is 42.9 lbm/MMscf ( = 137.3 lbm/3.2 MMscf ) table below fact that significant... Rate and increases blood pressure tbl ) { Pressure-temperature-composition charts and pressure-temperature monographs Vol. Be drinking more than half of your body uses water to maintain its,. A hydrate < br > 3 ) provides the MeOH or MEG concentration in gas... Amount of MeOH partitions into the vapor and liquid hydrocarbon phases and wellness at age. For V-LW water dewpoints ) or Fig 3 Pressure/temperature curves for predicting hydrate formation from... Content of selected foods table below, E.D { Pressure-temperature-composition charts and pressure-temperature monographs Vol!, not eight has to be 65.96 % oxygen this method is only approximate for several reasons <...
WebLamotrigine hydrate is an effective oral active anticonvulsant or antiepileptic agent that selectively blocks voltage-gated Na + channels, stabilizes presynaptic neuronal membranes and inhibits glutamate release.
Formula of a Hydrate (Anhydrous Solid xH 2O) The formula of a hydrate can be determined by dehydrating a known mass of the hydrate, then comparing the masses of the original hydrate and the resulting anhydrous solid. WebThis video covers how to calculate the percentage composition of a hydrate
About 11.5 cups (2.7 liters) of fluids a day for women. hbbd``b`Z
$[A-`m / 1 B-CH.(d100R About 15.5 cups (3.7 liters) of fluids a day for men. The Hammerschmidt[10] equation (Eq. Our water calculator will help you easily estimate how much water you need per day including how much of it you will need to drink in the form of fluids (pure water or beverages).
There is strong evidence from meta analyses of randomized controlled trials that exercise related asthma is linked with low fluid intake. Thus, water drinking induced increase in sympathetic activity is an important and unrecognized component of daily energy expenditure and hence weight loss. If we look up the molar masses of each on the periodic table, we find the following: 63.55 + 32.06 + (4 x 16) = 159.61 grams per mole.
Katz, D.L. This means that for every mole of #BaCl_2#, you have 2 moles of water. Epsom salts is M g S O X 4 x H X 2 O. HUMo0Wh
3k@kn[ZHv7
v-SD>5W8Dh`2 Epsom salts is M g S O X 4 x H X 2 O. Proc., 64th Annual Convention of the Gas Producers Association, Houston, 125. The amounts of MeOH in Example 2 are shown in Table 6. In our example, 16 grams /
3 Pressure/temperature curves for predicting hydrate formation (from Katz[8]). WebThe hydrate was found to be 65.96 % oxygen.
xyUt,6lfN)N-m-"Y
At 1,000 psia, the hydrate formation temperature is 61F at a gas gravity of 0.603. Presented at the Offshore Technology Conference, Houston, 30 April3 May. Soup is another food that is fluid-rich and can help you meet your target water intake. 2. Step 3Calculate the mass of liquid water/MMscf of natural gas. In our example, 16 grams / As theAmerican College of Sports Medicinepoints out, the intensity and duration of exercise affects how much you sweat and your subsequent fluid needs.
Step 6Calculate the amount of MeOH lost to the condensate. Calculating your recommended total daily water intake and thus optimal hydration requires the estimation of your total daily energy expenditure (TDEE) which measures how much energy (in kcal, kilocalories) you expend during a typical day. Our online calculators, converters, randomizers, and content are provided "as is", free of charge, and without any warranty or guarantee.
As indicated above, the 0.6-gravity chart (used for both hydrate formation and gas expansion) may have inaccuracies of 3.4 MPa (500 psia).
As theMayo Clinicstates, hyponatremia may be life-threatening.