Consider the dissolution of MnS in water.[K_sp(MnS) =3.0 × 10^-14] MnS(s) + H₂O(l) Mn²⁺(aq) + HS^-(aq) + OH^-(aq)
How is the solubility of manganese(II) sulfide affected by the addition of aqueous potassium hydroxide to the system?

Question

Consider the dissolution of MnS in water.[K_sp(MnS) =3.0 × 10^-14] MnS(s) + H₂O(l)

Consider the dissolution of MnS in water.[K<sub>sp</sub>(MnS) =3.0 × 10<sup>-14</sup>] MnS(s) + H<sub>2</sub>O(l) Mn<sup>2+</sup>(aq) + HS<sup>-</sup>(aq) + OH<sup>-</sup>(aq) 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<sub>a</sub> of H<sub>2</sub>S is needed before a reliable prediction can be made.

Mn²⁺(aq) + HS^-(aq) + OH^-(aq)
How is the solubility of manganese(II) sulfide affected by the addition of aqueous potassium hydroxide to the system?

Quizplus · Accepted Answer

When aqueous potassium hydroxide is added to the system, the hydroxide ions will react with the hydrogen sulfide ions produced from the reaction between water and the dissolved hydrogen sulfide gas. H2S + OH- --> HS- + H2O. This reaction will shift the equilibrium of the original dissolution reaction to the left, decreasing the amount of dissolved MnS and therefore decreasing its solubility.

Consider the Dissolution of MnS in Water