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Introductory Chemistry: A Foundati...

9th Edition
Steven S. Zumdahl + 1 other
ISBN: 9781337399425

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BuyFindarrow_forward

Introductory Chemistry: A Foundati...

9th Edition
Steven S. Zumdahl + 1 other
ISBN: 9781337399425
Textbook Problem
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. Explain how dissolving a slightly soluble salt to form a saturated solution is an equilibrium process. Give three balanced chemical equations for solubility processes and write the expressions for corresponding to the reactions you have chosen. When writing expressions for Ksp,why is the concentration of the sparingly soluble salt itself not included in the expression? Given the value for the solubility product for a sparingly soluble salt, explain how the molar solubility, and the solubility in g/L. may be calculated.

Interpretation Introduction

Interpretation:

The reason as to why dissolving a slightly soluble salt to form a saturated solution is an equilibrium process is to be explained. Three balanced chemical equations for solubility processes and the expressions for Ksp of the chosen reactions are to be stated. The reason as to why the concentration of the sparingly soluble salt itself is not included in the expression is to be explained. The calculation of molar solubility and the solubility in g/L, for a given value of solubility product, is to be explained.

Concept Introduction:

The equilibrium state of a chemical reaction is the state at which the rate of reaction going into the forward direction becomes equal to the rate of reaction going into the backward direction. A general equilibrium reaction is represented as,

AB+C.

Explanation

When a slightly soluble salt is dissolved to form a saturated solution, initially the salt starts dissolving into the solution till a particular point. After saturation point of the solution is reached the ions starts colliding to form solid salt. The amount of salt dissociating in aqueous medium becomes equal to the amount of salt ion associating to form solid salts. The rate of forward process become equal to rate of backward process therefore, this process is an equilibrium process. The general equilibrium reaction for dissolution of a salt in aqueous medium is represented as,

ABsA+aq+Baq

The balanced chemical equation for solubility process of PbCl2 is represented as,

PbCl2sPb2+aq+2Claq

The expression for solubility product of the above equation is given as,

Ksp=Pb2+Cl2

The balanced chemical equation for solubility process of Ag2CrO4 is represented as,

Ag2CrO4s2Ag+aq+CrO42aq

The expression for solubility product of the above equation is given as,

Ksp=Ag+

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