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A monoprotic weak acid, HA , dissociates in water according to the reaction HA(aq)+H2O(l)↽−−⇀H3O+(aq)+A−(aq) The equilibrium concentrations of the reactants and products are [HA]=0.200 M , [H3O+]=3.00×10−4 M , and [A−]=3.00×10−4 M . Calculate the 𝐾a value for the acid HA .