Given the two reactionsh2shs-hnbspnbspk1 972times10-8

Question

Given the two reactions

1. H2S?HS-+H+,  K1= 9.72×10^-8, and
2. HS-?S2-+H+,  K2= 1.34×10^-19,

what is the equilibrium constantKfinalfor the following reaction?

S2-+2H+?H2S

 

Given the two reactions

1. PbCl2?Pb2++2Cl-,  K3= 1.78×10^-10, and
2. AgCl?Ag++Cl-,  K4= 1.20×10^-4,

what is the equilibrium constantKfinalfor the following reaction?

PbCl2+2Ag+?2AgCl+Pb2+