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Given a weak acid HA with an initial concentration of 0.1 M and a Ka of 1.8 x 10-5, use an ICE chart to find the equilibrium concentration of H3O+.

Given a weak acid HA with an initial concentration of 0.1 M and a K_a of 1.8 x 10^-5, use an ICE chart to find the equilibrium concentration of H₃O⁺.