H3po4 undergoes three ionization equilibria for each, Ask an Expert

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H₃PO₄ undergoes three ionization equilibria, for each ionization pka's 2.12, 7.21, and 12.3 respectively. A solution formed by mixing 100 mL of 0.1 M NaH₂PO₄and 100 mL of 0.1 M Na₂HPO₄ now you just need to calculate the pH of this solution? if we want to lower the pH by one unit of this solution then How many mL of 0.1 M H₃PO₄ should be added to this solution?

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