计算说明zns溶于HCL而CUS不溶于HCL

假设1L溶液中溶解了0.1mol的MS,则：
MS + 2H+ = H2S + M2+ K = Ksp(MS) / K1(H2S)*K2(H2S)
0.1 0.1
[H2S][M2+]/ [H+]2 = Ksp(MS) / K1(H2S)*K2(H2S)
[H+] = [0.1*0.1*K1(H2S)*K2(H2S)/ Ksp(MS)]^ 1/2
查出H2S的K1,K2,难溶物的Ksp即可进行计算,得到平衡时的[H+].
Ksp(CuS) = 8.5*10^-45 ,算出[H+]实际HCl根本达不到,因为常见浓盐酸的浓度只有12mol/L