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31-05-2017
Chemistry

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determine the chemical reaction when we add (NH4)3PO4+H2O-> H2O?

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dec77cat dec77cat

31-05-2017

(NH₄)₃PO₄ → 3NH₄⁺ + PO₄³⁻

the hydrolysis of the cation
NH₄⁺ + H₂O ⇄ NH₃ + H₃O⁺

the hydrolysis of the anion
PO₄³⁻ + H₂O ⇄ HPO₄²⁻ + OH⁻
HPO₄²⁻ + H₂O ⇄ H₂PO₄⁻ + OH⁻
H₂PO₄⁻ + H₂O ⇄ H₃PO₄ + OH⁻

a possible scheme of hydrolysis
(NH₄)₃PO₄ + 3H₂O ⇄ 3NH₃·H₂O + H₃PO₄

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