Salt of weak acid - NaH2PO4/ Na2HPO4 / Na3PO4, Weak acid - H3PO4 / H2PO4- / HPO42- / an acid that partially ionizes in water, Buffer - A mixture of a strong base and weak acid that resists changes to pH, pKa - -log10(Ka) = -log10([H+]2/[HA]) = -log10([H+][A-]/[HA]), Half equivalence point - Half of the volume required to reach the equivalence point. , Equivalence point - The point in the titration where the acid has reacted with 1 molar equivalent of the base.  , Triprotic - An acid capable of donating up to 3 protons. , Brønsted–Lowry acid - A proton (H+) donor, pH - -log10([H+]), Brønsted–Lowry base - A proton (H+) acceptor,

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