Why does the solubility increase when you add HCl and ammonia but decrease when

Question

Why does the solubility increase when you add HCl and ammonia but decrease when you add NaOH?

b. For each of the following, circle the correct answer to indicate how the solubility of Cu3(PO4 will change relative to that of a saturated aqueous solution. i. Adding HCl(aq) will: 13 points] Increase solubility Decrease solubility Have no effect on solubility ii. Adding Na0H(aq) will: [3 pointsJ Increase solubility Decrease solubility Have no effect on solubility iii. Adding NH3(aq) will: 13 points] Increase solubility Decrease solubility Have no effect on solubility

Explanation / Answer

The solubility decreases effectively in case of NaOH because NaOH removes hydrogen ion from the system by converting it to water, the "stress" from the equilibrium's point of view would be a decrease in the hydrogen ion concentration.

But in case of HCl and ammonia, the H+ ions react with some of the OH- ions to make water. Since there are now fewer OH- ions in solution the equilibrium shifts to try and compensate and bring the concentration back up.Hence solubility increases.

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