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Phosphoric acid is a weak triprotic acid with the formula H3PO4. If you have 50.0 mL of a 1.0 M solution of H3PO4, how many grams of NaOH (MM = 40.0g/mol) should you add to make a buffer with a pH of 7.00?

Acid           Ka

H3PO4       7.1 * 10^-3

H2PO4-      6.3 * 10^-8

HPO4 2-     4.2 * 10^-13

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