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# Dependence of Solubility on pH

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Sections
General Approach to Acid-Base Systems
Fractional Compositions and Concentrations
Dependence of Solubility on pH
###### Davies Equation

Concept #1: When the size parameter of the ion is unknown we can instead use the Davies Equation

Example #1: Calculate the activity coefficient of Ca2+ in 0.025 M Ca3(PO4)2.

###### Ionic Salts & Solubility

Concept #2: Cations are able to create acidic or neutral solution and increasing the basicity will increase their solubility.

Concept #3: Anions are able to create basic or neutral solution and increasing the acidity will increase their solubility.

Example #2:

BaCO3 is the slightly soluble ionic salt that results from the reaction between Ba(OH)2 and H2CO3. Identify the effect of increasing acidity on the solubility of the given compound.

Example #3:

Which salts will be more soluble in an acidic solution than in pure water?

a. CuBr

b. Ag2SO4

c. BaSO3

d. Sn(OH)2

e. KClO4