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A monoprotic weak acid, HA , dissociates in water according to the reaction HA(aq)H+(aq)+A(aq) The equilibrium concentrations of the reactants and products are [HA]=0.200 M

A monoprotic weak acid, HA , dissociates in water according to the reaction HA(aq)H+(aq)+A(aq) The equilibrium concentrations of the reactants and products are [HA]=0.200 M , [H+]=2.00104 M , and [A]=2.00104 M . Calculate the value of pa for the acid HA .

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