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A monoprotic weak acid, HA, dissociates in water according to the reaction

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] =0.270 M,[H₃O⁺]=3.00 × 10-4 M, and [A-]=3.00 × 10-4 M. Calculate the Ka value for the acid HA.

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