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H3PO4 is a tribasic acid and one of its salts is NaH2PO4. What volume of 1 M NaOH should be added to 12g NaH2PO4 (Molar mass 120) to exactly convert it into Na3PO4?

(a) 100 mL

(b) 300mL

(c) 200mL

(d) 80mL