Phosphoric acid is a weak acid that ionizes partially in its aqueous solution.
H3PO4(aq) + H2O(ℓ) ⇌ H3O+(aq) + H2PO4-(aq).
KH2PO4 → K+(aq) + H2PO4-(aq)
conjugate base → H2PO4-(aq)
K+ → no contribution to pH
Calculate the pH of a buffer solution prepared from 0.155 mol of phosphoric acid, 0.250 mole of KH2PO4, and enough water to make 0.500 L of solution.
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