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Weak AcidA weak acid is an acid that does not fully ionize in solution; that is, if the acid was represented by the general formula AH, then in aqueous solution a significant amount of undissolved AH still remains. HA(aq) H+(aq) + A-(aq) The equilibrium concentrations of reactants and products are related by the Acidity constant expression, (Ka)''': Ka = H+A-/HA. The greater the value of Ka, the more the formation of H+ is favored, and the lower the pH of the solution. The vast majority of acids are weak acids. Examples
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