Stearic acid is insoluble in water, and sodium stearate (a soap) is soluble. What causes the difference in solubility? Explain.
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Stearic acid is insoluble in water, and sodium stearate (a soap) is soluble. What causes the difference in solubility? Explain.
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- A glucosamine solution of unknown concentration was diluted as follows: 1 mL of the solution was diluted to 5.0 mL. A 0.3 mL aliquot of this solution was diluted with 0.7 mL of water; the absorbance of this was measured and found to be 0.440 (uncorrected, must subtract blank). What is the concentration of the original undiluted glucosamine hydrochloride solution in µmol/mL? Given: Corrected absorbance = 0.395 y= 1.165x+0.055 Standard equationConsider the following pH titration curve of a diprotic acid. What is the approximate values for pka 1 and pka 2? the curve is attached below.Ionic interactions are weaker in water than they are in an anhydrous medium. Describe how water reduces the strength of these interactions.
- Which lipid sample (butter/oil is soluble or miscible in water? Explain.Dextran is a polymeric carbohydrate produced by certain bacteria. It is used as a blood plasma substitute. An aqueous solution contains 0.582 g of dextran in 106 mL of solution at 21°C. It has an osmotic pressure of 1.47 mmHg. What is the average molecular mass of the dextran?Is sodium propanoate (the sodium salt of propanoic acid) as effective a soap as sodium stearate (the sodium salt of stearic acid)? Explain.
- A 1–fluid ounce (29.573 mL) solution contains 4.5 grains (291.60 mg) of silver nitrate. How much sodium nitrate must be added to this solution to make it isotonic with nasal fluid?Which lipid sample (butter/ oil) is soluble or miscible in 70% ethanol? Explain. Do you think the solubility of the lipid samples will change if 100% ethanol is used instead?Gout is caused by an error in metabolism that leads to abuildup of uric acid in body fluids, which is deposited as slightlysoluble sodium urate (C₅H₃N₄O₃Na) in the joints. If the extra-cellular [Na⁺] is 0.15 Mand the solubility of sodium urate is0.085 g/100. mL, what is the minimum urate ion concentration(abbreviated [Ur⁻]) that will cause a deposit of sodium urate?
- Butanoic acid (C3H7COOH) is described as a weak acid. Define the term weak acidThe normal range of the sodium electrolyte in the body is 134 to 145 mEq/L. The term mEq is dependent on the charge of the ion. Since sodium is a +1 ion, 134 mEq/L is the same as 134 mmol/L. An ion that has a greater positive or negative charge; however, will have 1 mEq for each positive or negative charge of the ion for every 1 mmol. For example, for Ca+2, 2mEq/1mmol. If the standard range of Magnesium in the body is 0.70 to 0.95 mmol/L, convert this value into mEq/L for the Mg2+ ion. (Use dimensional analysis to figure this out)Refer to the following titration curve below: 13 12 11 10 7 6 5 4 4 6 8 10 12 14 16 18 20 22 24 26 28 30 Volume of Titrant / mL - Unknown Acid 0.10 mol/L - titrant = NaOH 0.1 mol/L What is the isoelectric point of histidine, according to the titration curve? Input your answer until the first decimal point. 2. 9,