The multiple equilibria of insoluble metal sulfides MS(s)M2(ag)+s2 (aq) S2:S2(aq)+H2O(1)-HS (aq)+OH (aq) MS(s)+H2O(1)-M2(aq)+OH (aq)+HS (aq) Ke={c(M2*)}{c(OH)}{c(HS)} The solubility equilibria of insoluble metal sulfides in acidic solution:MS(s)H(aq)M(aq)+HS(aq) ke=ic(M))c(H,S)e(S>-) {c(H)}2c(S2) or K K(MS) 。Fk@H,SK8,S) The solubility equilibria of insoluble metal sulfides in acidic solution： The multiple equilibria of insoluble metal sulfides ： + 2+ 2- MS(s) M (aq) S (aq) ： + + - - - - 2 2 2 S S (aq) H O(l) HS (aq) OH (aq) + - - + + + 2 2 MS(s) H O(l) M (aq) OH (aq) HS (aq) = 2+ - - K {c(M )}{c(OH )}{c(HS )} + + + + 2 2 MS(s) 2H (aq) M (aq) H S(aq) = - - + 2 2 2 2 2+ spa (S ) (S ) (H )} (M )} (H S)} c c {c {c {c K or = a1 2 a2 2 sp spa (H S) (H S) (MS) K K K K