AaBb aA+ + bB- with Ksp1 and
aA+ + cC- AaCc with K = 1/Ksp2.
From Section 16.2 we remember that the equilibrium constant for the sum of two reactions is the product of the individual reactions. So the equilibrium constant for the sum of these two reactions would be
Knet = Ksp1 x K = Ksp1/Ksp2.
If we then wanted to see if we could convert AgCl to AgBr, we could calculate the equilibrium constant for the reaction AgCl(s) + Br-(aq) --> AgBr(s) + Cl-(aq)
using the two reactions
Ag+(aq) + Br- AgBr(s) and the reverse of the reaction
Ag+(aq) + Cl-(aq) AgCl(s) (remember that the equilibrium constant for the reverse of a reaction is the inverse of the original equilibrium constant).
Web Author: Dr. Leon L. Combs
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