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Calculate the pH at 25 C of a 0.75 M aqueous solution of phosphoric acid (H3PO4)....

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Chemistry

Calculate the pH at 25 C of a 0.75 M aqueous solution ofphosphoric acid (H3PO4). (Ka1, Ka2, and Ka3 for phosphoric acid are7.5*10-3, 6.25*10-8, and4.8*10-13, respectively.)

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M 075 M of H3A H3A H H2A H2A H HA2 HA H A3 This will be formed We need the H concentration From the first equilbrium Ka1 H2AH H3A Ka2 HA2H H2A Ka3 A3 H HA There will be three H to account the Ka1 Ka2 and form Ka3 Let us calculate first the ammount of Ka1 H ions NOTE H2A H x since for 1 mol of H you will have always another mol of    See Answer
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