The balanced chemical equation for the first dissociation of the polyprotic acid H3PO3 in water is as:
H₃PO₃ + H₂O ⇌ H₂PO₃⁻ + H₃O⁺
Polyprotic acids are acids having more than one acidic proton or upon dissociation, they give more than one proton. When these polyprotic acids are added to water they give the acidic proton in several dissociation processes. In each step of dissociation, one acidic proton is released by the acids. Phosphorous acid (H₃PO₃) also dissociates in several steps, in the first step Phosphorous acid (H₃PO₃) releases a proton and gets negatively charged. The first step of dissociation will be as follows.
H₃PO₃ + H₂O ⇌ H₂PO₃⁻ + H₃O⁺
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