Răspuns :
cele trei trepte de iozicare, fiecare caracterizate de constanta de aciditate Ka
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H3PO4 + H2O → H2PO4⁻ + H3O⁺
H2PO4⁻ + H2O → HPO4⁻² + H3O⁺
HPO4⁻² + H2O → PO4⁻³ + H3O⁺
H2PO4⁻ + H2O → HPO4⁻² + H3O⁺
HPO4⁻² + H2O → PO4⁻³ + H3O⁺