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Ch.17 - Aqueous Ionic Equilibrium
All textbooksTro 4th EditionCh.17 - Aqueous Ionic EquilibriumProblem 126
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Chapter 17, Problem 126

If the sodium concentration in blood plasma is 0.140 M, and Ksp for sodium urate is 5.76 * 10^-8, what minimum concentration of urate would result in precipitation?

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1
Identify the chemical equilibrium involved: NaC5H3N4O3 (s) ⇌ Na^+ (aq) + C5H3N4O3^- (aq).
Write the expression for the solubility product constant (K_{sp}): K_{sp} = [Na^+][C5H3N4O3^-].
Substitute the given values into the K_{sp} expression: 5.76 \times 10^{-8} = (0.140)[C5H3N4O3^-].
Solve for the concentration of urate ion, [C5H3N4O3^-], by dividing K_{sp} by the sodium ion concentration: [C5H3N4O3^-] = \frac{5.76 \times 10^{-8}}{0.140}.
Interpret the result: The calculated [C5H3N4O3^-] is the minimum concentration of urate required for precipitation to occur.
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Related Practice
Open Question
From the data given—where a 0.552-g sample of ascorbic acid (vitamin C) is dissolved in water to a total volume of 20.0 mL and titrated with 0.1103 M KOH, the equivalence point occurred at 28.42 mL, and the pH of the solution at 10.0 mL of added base was 3.72—determine the molar mass and dissociation constant (Ka) for vitamin C.
Open Question
Calculate the pH at the beginning of the titration, at the equivalence point, at one-half of the equivalence point, and at 5.0 mL beyond the equivalence point to sketch the titration curve from Problem 123. Then, choose a suitable indicator for this titration from Table 17.1.
Open Question
If a hard water solution is saturated with calcium carbonate, what volume of the solution has to evaporate to deposit 1.00 × 10^2 mg of CaCO3, given that one of the main components of hard water is CaCO3, and when hard water evaporates, some of the CaCO3 is left behind as a white mineral deposit?
Textbook Question

Pseudogout, a condition with symptoms similar to those of gout (see Problem 126), is caused by the formation of calcium diphosphate (Ca2P2O7) crystals within tendons, cartilage, and ligaments. Calcium diphosphate will precipitate out of blood plasma when diphosphate levels become abnormally high. If the calcium concentration in blood plasma is 9.2 mg/dL, and Ksp for calcium diphosphate is 8.64⨉10-13, what minimum concentration of diphosphate results in precipitation?

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Textbook Question

Calculate the solubility of silver chloride in a solution that is 0.100 M in NH3.

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Textbook Question

Calculate the solubility of CuX in a solution that is 0.150 M in NaCN. Ksp for CuX is 1.27⨉10-36.

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