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An aqueous solution contains 2.1 x 10° mol/L Ca2*. Enough HF was then added to the solution to reach an equilibrium concentration of [HF] = 5.5 x 10“ mol/L. What must be the pH of the solution in order to observe a precipitate of CaF2? (Hint: Assume any change in pH will not change the value of [HF]). Ksp of CaF2 = 5.3 × 10-9 Ka of HF = 7.2 × 10-4 %3D

An aqueous solution contains 2.1 x 10° mol/L Ca2*. Enough HF was then added to the solution to reach an equilibrium concentration of [HF] = 5.5 x 10“ mol/L. What must be the pH of the solution in order to observe a precipitate of CaF2? (Hint: Assume any change in pH will not change the value of [HF]). Ksp of CaF2 = 5.3 × 10-9 Ka of HF = 7.2 × 10-4 %3D

Chemistry
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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5. a) An aqueous solution contains 2.1 x 10³ mol/L Ca²*. Enough HF was then added to the solution to reach an equilibrium concentration of [HF] = 5.5 x 10“ mol/L. What must be the pH of the solution in order to observe a precipitate of CaF2? (Hint: Assume any change in pH will not change the value of [HF]). Ksp of CaF2 = 5.3 × 10-9 Ka of HF = 7.2 × 10-4 %3D 5. b) Predict and briefly explain the sign of AS for each of the following processes. (Don't write an essay, one short sentence is sufficient explanation). Nis) + 4 CO(g) → Ni(CO)4(9) i. ii. H20 (s) → H20(1) H20 (1)
Transcribed Image Text:5. a) An aqueous solution contains 2.1 x 10³ mol/L Ca²*. Enough HF was then added to the solution to reach an equilibrium concentration of [HF] = 5.5 x 10“ mol/L. What must be the pH of the solution in order to observe a precipitate of CaF2? (Hint: Assume any change in pH will not change the value of [HF]). Ksp of CaF2 = 5.3 × 10-9 Ka of HF = 7.2 × 10-4 %3D 5. b) Predict and briefly explain the sign of AS for each of the following processes. (Don't write an essay, one short sentence is sufficient explanation). Nis) + 4 CO(g) → Ni(CO)4(9) i. ii. H20 (s) → H20(1) H20 (1)
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