Question

Which of the following ionic salts will not increase the solubility in acidic aqueous solution relative...

Which of the following ionic salts will not increase the solubility in acidic aqueous solution relative to its solubility in pure water?

(a) NaF; (b) LiCl; (c) Ca(ClO4)2; (d) NH4CH3COO; (e) KNO2; (f) Cu(NO3)2

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Homework Answers

Answer #1

The correct answer is : (b) LiCl , (c) Ca(ClO4)2, (f) Cu(NO3)2

Explanation

Salts of weak acids dissociate in acidic aqueous solutions and the conjugate base reacts with water molecule to give acid and OH- ion

For example, when NaF is dissolved in acidic aqueous solution, it completely dissociates into Na+ and F- ions

F- (aq) + H2O (l) HF (aq) + OH- (aq)

Decrease in concentration of F- causes more NaF to dissolve in solution to maintain concentration of F-

Hence solubility of NaF increases in acidic aqueous solution

This does not happen with salts of strong acids.

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