HA, a weak acid, with K a = 1.0 * 10 -8 , also forms the ion

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HA, a weak acid, with Ka = 1.0 * 10-8, also forms the ion HA2. The reaction is HA(aq) + A(aq) ⇌ HA2(aq) and its K = 4.0. Calculate the [H+], [A], and [HA2] in a 1.0 M solution of HA.

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