Phosphoric acid has a formula of H3PO4 , and has a Ka1 of 7.5×10–3 , Ka2 of 6.2×10–8 , and Ka3 of 4.2×10–13 at 25 ºC.  What is the equilibrium constant for the following reaction at 25°C? HPO42– (aq) + H2O(l) -> H2PO4– (aq) + OH– (aq)

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