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2 May, 01:21

Phosphoric acid is a polyprotic acid. Write balanced chemical equations for the sequence of reactions that phosphoric acid can undergo when it's dissolved in water. True or false?

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  1. 2 May, 05:06
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    True. It is a polyprotic acid because it can release more than one proton. In this case this weak acid releases 3 protons, donated to water to increase the hydronium concentration. There are 3 equilibriums.

    Explanation:

    H₃PO₄ + H₂O ⇄ H₃O⁺ + H₂PO₄⁻ Ka₁

    H₂PO₄⁻ + H₂O ⇄ H₃O⁺ + HPO₄⁻² Ka₂

    HPO₄⁻² + H₂O ⇄ H₃O⁺ + PO₄⁻³ Ka₃

    Diprotic acids → They release 2 H⁺

    Carbonic acid

    Monoprotic acids → They release 1 H⁺

    Acetic acid
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