Question

Which metal Sulphide has maximum water solubility?

Answer 1

1. Sulphides are compounds having one or more ${\mathrm{S}}^{2-}$.
2. Many metal Sulphides naturally occur in form of minerals like Pyrite. Example: Iron Sulphide$\left(\mathrm{FeS}\right)$.
3. The solubility of Metal sulphides can be calculated by ${\mathrm{K}}_{\mathrm{sp}}$value that is the solubility product of the salt.
4. ${\mathrm{K}}_{\mathrm{sp}}$value helps in predicting whether salt is soluble or not.
5. Metal sulphide ($\mathrm{FeS}$ ) has the highest ${\mathrm{K}}_{\mathrm{sp}}$value that is $11\times {10}^{-20}$.
6. Thus, $\mathrm{FeS}$ has maximum solubility in water.