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)] = 0.000142 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)] = 0.000142 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 compound is calculated by multiplying the concentrations of the ions in the solution. In this case, the equation for the dissolution of MS is:
MS(s) ⇋ M2+(aq) + S2-(aq)
The concentrations of M2+ and S2- in the solution are both 0.000142 mol L-1. Therefore, the Ksp is calculated as follows:
Ksp = [M2+][S2-] = (0.000142)(0.000142) = 2.0164e-8
So, the Ksp for the compound MS is 2.02e-8 (to three significant figures).
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