Problem: Consider the dissolution of MnS in water (Ksp = 3.0 x 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? (You now have too much OH– present; remember that the reaction needs to shift in such a way as to return to an equilibrium state.) A. The solubility will increase. B. The solubility will be unchanged. C. The pKa, of H2S is needed before a reliable prediction can be made. D. The solubility will decrease. E. The amount of KOH added must be known before its effect can be predicted. 

FREE Expert Solution

According to Le Chatelier’s Principle, if a system (chemical reaction) is at equilibrium and we disturb it, then the system will readjust to maintain its equilibrium state.


The dissolution of MnS in water is

MnS(s) + H2O(l)  Mn2+(aq) + HS(aq) + OH(aq)


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Problem Details

Consider the dissolution of MnS in water (Ksp = 3.0 x 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? (You now have too much OH present; remember that the reaction needs to shift in such a way as to return to an equilibrium state.) 

A. The solubility will increase. 

B. The solubility will be unchanged. 

C. The pKa, of H2S is needed before a reliable prediction can be made. 

D. The solubility will decrease. 

E. The amount of KOH added must be known before its effect can be predicted. 

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