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If the concentration of H2A in a solution is 0.1 M and Ka1 is 1.0 x 10-3, what is the concentration of H3O+ at equilibrium?

If the concentration of H₂A in a solution is 0.1 M and K_a1 is 1.0 x 10^-3, what is the concentration of H₃O⁺ at equilibrium?