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An aqueous solution of 0.100 M phosphoric acid (12.0 mL) is titrated with 0.400 M KOH as shown below. phosphoric acid has three pKas: 2.148, 7.198, 12.375.

H3PO4(aq) + OH-(aq) \rightarrow H2PO4-(aq) + H2O(l)

H2PO4-(aq) + OH-(aq) \rightarrow HPO42-(aq) + H2O(l)

HPO42-(aq) + OH-(aq) \rightarrow PO43-(aq) + H2O(l)

Calculate the pH of phosphoric acid solution before any KOH has been added.

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Answer #1

Kaya Hapon + H+ H₂PO4 F H2PO4 mostly it is mainly generated from Forst dissociation and pr is given by pha t C Pka, -log c) c

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