± Introduction to Solubility and the Solubility Product Constant Learning Goal: To learn how to calculate the solubility...

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Chemistry

± Introduction to Solubility and the Solubility ProductConstant

Learning Goal:

To learn how to calculate the solubility from Kspandvice versa.

Consider the following equilibrium between a solid salt and itsdissolved form (ions) in a saturated solution:

CaF2(s)⇌Ca2+(aq)+2F−(aq)

At equilibrium, the ion concentrations remain constant because therate of dissolution of solid CaF2 equals the rate of the ioncrystallization. The equilibrium constant for the dissolutionreaction is

Ksp=[Ca2+][F−]2

Ksp is called the solubility product and can bedetermined experimentally by measuring thesolubility,which is the amount of compound that dissolves per unit volume ofsaturated solution.

Part A

A saturated solution of lead(II) chloride, PbCl2, was preparedby dissolving solid PbCl2 in water. The concentration of Pb2+ ionin the solution was found to be 1.62×10−2M .Calculate Ksp for PbCl2.

Express your answer numerically.

Ksp =

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Part B

The value of Ksp for silver sulfide, Ag2S, is8.00×10−51. Calculate the solubility of Ag2S in grams perliter.

Express your answer numerically in grams per liter.

Answer & Explanation Solved by verified expert
4.3 Ratings (656 Votes)
Part APbCl2 dissociate asPbCl2 Pb2 2ClKsp Pb2 Cl2Pb2 162 102then Cl    See Answer
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