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19 Feb 2022
1. D-Tartaric acid (D-2,3-dihydroxybutanedioic acid, but call it "HzA") is a diprotic acid with the following acid dissociation constants: pK: 3.036 and pK2 = 4.366. In this problem, neglect activity coefficients and ion pairing and use pKw 13.998. Please calculate all pH values to 3 decimal places (not 2 like we usually do), and keep a little extra precision on any calculated α values. a. (2 pts) Calculate the fractional compositions ao, a, and a for the three forms of tartaric acid at pH 2.532, pH = 3.036, and pH = 3.724. The numerator for a2 is always 10-7.402-3.962x 10-8. The numerators for ao and vary with pH. Please use the following table to organize your calculations. pH = 2.532 pH = 3.036 pH 3.724 numerator for ao = α2 = 3.9627 à 10-8 3.9627 x 10-8 3.9627 x 10-8 denominator D = fractional compositions... ao = CQ= b. (1 pt) Write the charge balance equation for a solution of tartaric acid that was adjusted to some desired pH using KOH. C. (1 pt) write a mass balance equation for total tartrate in an F = 0.01200 M solution of tartaric acid. An F = 0.01200 M solution of potassium hydrogen tartrate will have this same mass balance equation for total tartrate, and a second mass balance equation for potassium. Write this second equation.
1. D-Tartaric acid (D-2,3-dihydroxybutanedioic acid, but call it "HzA") is a diprotic acid with the following acid dissociation constants: pK: 3.036 and pK2 = 4.366. In this problem, neglect activity coefficients and ion pairing and use pKw 13.998. Please calculate all pH values to 3 decimal places (not 2 like we usually do), and keep a little extra precision on any calculated α values. a. (2 pts) Calculate the fractional compositions ao, a, and a for the three forms of tartaric acid at pH 2.532, pH = 3.036, and pH = 3.724. The numerator for a2 is always 10-7.402-3.962x 10-8. The numerators for ao and vary with pH. Please use the following table to organize your calculations. pH = 2.532 pH = 3.036 pH 3.724 numerator for ao = α2 = 3.9627 à 10-8 3.9627 x 10-8 3.9627 x 10-8 denominator D = fractional compositions... ao = CQ= b. (1 pt) Write the charge balance equation for a solution of tartaric acid that was adjusted to some desired pH using KOH. C. (1 pt) write a mass balance equation for total tartrate in an F = 0.01200 M solution of tartaric acid. An F = 0.01200 M solution of potassium hydrogen tartrate will have this same mass balance equation for total tartrate, and a second mass balance equation for potassium. Write this second equation.
20 Feb 2022
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