A specific metal ion, M2+, forms a relatively insoluble sulfide compound, MS, which dissolves to a very limited extent.MS(s) ⇋ M2+(aq) + S2-(aq)The concentration of ions in a saturated solution was found:[M2+(aq)] ≡ [S2-(aq)] = 0.000221 mol L-1.Calculate Ksp for the compound MS.Give three significant figures.Enter your answer in exponential form, for example, enter 0.000000672 as 6.72e-7 with no gaps and the -ve e if power is -ve.
Question
A specific metal ion, M2+, forms a relatively insoluble sulfide compound, MS, which dissolves to a very limited extent.MS(s) ⇋ M2+(aq) + S2-(aq)The concentration of ions in a saturated solution was found:[M2+(aq)] ≡ [S2-(aq)] = 0.000221 mol L-1.Calculate Ksp for the compound MS.Give three significant figures.Enter your answer in exponential form, for example, enter 0.000000672 as 6.72e-7 with no gaps and the -ve e if power is -ve.
Solution
The Ksp (solubility product constant) for a reaction is calculated by multiplying the concentrations of the ions in the reaction. In this case, the reaction is:
MS(s) ⇋ M2+(aq) + S2-(aq)
The concentrations of M2+ and S2- are both 0.000221 mol L-1.
So, to calculate Ksp, you multiply these concentrations together:
Ksp = [M2+][S2-] = (0.000221)(0.000221) = 4.8841e-8
So, the Ksp for the compound MS is 4.88e-8 to three significant figures.
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