Dependence of Solubility on pH

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.

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