General Chemistry
General Chemistry
4th Edition
ISBN: 9781891389603
Author: Donald A. McQuarrie, Peter A. Rock, Ethan B. Gallogly
Publisher: University Science Books
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Chapter 22, Problem 22.71P
Interpretation Introduction

Interpretation:

The pH at which Ca(OH)2(s) can be separated from Mg(OH)2(s) should be calculated.

Concept Introduction:

Solubility is defined as the maximum quantity of solute dissolved in a given amount of solvent to make a saturated solution at a particular temperature.

Molar solubility is the number of moles of a solute that can be dissolved in one liter of a solution. It is expressed as mol/L or M (molarity).

Consider a general reaction:

  MnXm(s)nMm+(aq)+mXn+(aq)

The relation between solubility product and molar solubility is as follows:

  Ksp=[Mm+]n[Xn-]m

Here

The solubility product of salt is Ksp.

The molar solubility of Mm+ ion is [Mm+]

The molar solubility of Xn- ion is [Xn-]

pH definition:

The concentration of hydrogen ion is measured using pH scale. The acidity of aqueous solution is expressed by pH scale.

  pH=-log[H3O+]

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