Write the Ksp expression for the sparingly soluble compound cobalt(II) sulfide, CoS. If either the numerator or denominator is 1, please enter 1.

Explanation:

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In this case, according to the given information, it turns out firstly necessary to  write the chemical equation for this reaction as shown below:

Thus, since solids are not included in equilibrium expressions, we can set this one up as follows:

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