Acid-Base Equilibriaa Summary

“C” indicates the analytical concentration.

For example, CA would be the molarity of an acid solution assuming no dissociation. CB and CS would be the same for a base and a salt.

Acid-Base Equilibriaa Summary

So we might express an acid equilibrium equation as:

KA = [H+][A-]/[HA] = X2/(CA-X) ~ X2/CA

or (base): KB = X2/CB

or (acid buffer) KA = X*CS/CA

Acid-Base Equilibriaa Summary

Solutions of Salts:

SBSA: pH = 7

SBWA: pH > 7

WBSA: pH < 7

WBWA: pH depends on the KB of the base and the KA of the acid

Acid-Base Equilibriaa Summary

For SBWA salts, it is possible to show: KA*KB = KW where “KB” is the equilibrium constant for the WA anion.

For WBSA salts the same equations holds, but “KA” is the equilibrium constant for the WB cation.