Which of the following is the correct representation of the solubility product expression for mercurous iodide `(HgI_(2))` ?

Options

A. `[Hg_(2)^(2+)][I^(-)]^(2)`
B. `[Hg^(+)]^(2)[I^(-)]^(2)`
C. `[Hg^(+)][I^(-)]`
D. `[Hg^(2+)][I^(-)]^(2)`

Answer

A

Explanation

The solubility equilibrium can be represented as `Hg_(2)I_(2)(s)hArrHg_(2)^(2+)(aq.)+2I^(-)(aq.)` The solubility product of a compound is the product of the molar concentrations of the constituent ions, each raised to the power of its stoichiometric coefficient in the equilibrium equation: `K_(sp)=[Hg_(2)^(2+)][I^(-)]^(2)`