Problem: Given the two reactions:H2S ⇌ HS- + H+           K1 = 9.56 x 10 -8 and HS- ⇌ S2- + H+              K2 = 1.44 x 10 -19What is the equilibrium constant K final for the following reaction?S2- + 2H+ ⇌ H2S

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Problem Details

Given the two reactions:

H2S ⇌ HS- + H+           K1 = 9.56 x 10 -8 and 

HS- ⇌ S2- + H+              K2 = 1.44 x 10 -19

What is the equilibrium constant K final for the following reaction?

S2- + 2H+ ⇌ H2S

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