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22 January, 02:24

Which is the most prevalent species in a 0.25 m aqueous solution of phosphoric acid h3po4 g?

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  1. 22 January, 02:51
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    Answer is: H₃PO₄.

    A phosphoric acid is three protic acid, which means that in water release tree protons. Phosphoric acid ionizes in three steps in water.

    First step: H ₃PO₄ (aq) ⇄ H₂PO₄⁻ (aq) + H⁺ (aq).

    Second step: H ₂PO₄⁻ (aq) ⇄ HPO₄²⁻ (aq) + H⁺ (aq).

    Third step: HPO ₄²⁻ (aq) ⇄ PO₄³⁻ (aq) + H⁺ (aq).

    Species that are present: H ₃PO₄, H₂PO₄⁻, HPO₄²⁻, PO₄³⁻ and H⁺, but because the acid dissociation constants are low, very low percentage of acid dissociates.
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