Consider the dissolution of MnS in water How is the solubility of manganese(II) sulfide affected by the addition of aqueous potassium hydroxide to the system? A) The solubility will be unchanged. B) The solubility will decrease. C) The solubility will increase. D) The amount of KOH added must be known before its effect can be predicted. E) The pK_a of H₂S is needed before a reliable prediction can be made.

Question

Quizplus · Accepted Answer

The addition of aqueous potassium hydroxide to the system will result in the formation of insoluble manganese(II) hydroxide, according to the following reaction:
MnS + 2KOH → Mn(OH)2 + K2S
As a result, the concentration of manganese(II) ions in solution will decrease, causing a decrease in the solubility of MnS.

Consider the Dissolution of MnS in Water