Calculate the concentration of CuS in a solution in which $H_3{O}^{+}$is held constant at

$(K_{sp}(CuS)=8\mathrm{.}0{10}^{-37},K_1(H_2(S))=9\mathrm{.}6{10}^{-8},K_2(H_2(S))=1\mathrm{.}3{10}^{-14})$

a$.0\mathrm{.}75M$

Concentration $=|$

b$.7\mathrm{.}5{10}^{-4}M$

Concentration $=$

M

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