Question

You are instructed to create 600. mL of a 0.71 M phosphate buffer with a pH of 6.4. You have phosphoric acid and the sodium salts NaH2PO4, Na2HPO4, and Na3PO4 available. (Enter all numerical answers to three significant figures.) H3PO4(s) + H2O(l) equilibrium reaction arrow H3O+(aq) + H2PO4−(aq) Ka1 = 6.9 ✕ 10−3 H2PO4−(aq) + H2O(l) equilibrium reaction arrow H3O+(aq) + HPO42−(aq) Ka2 = 6.2 ✕ 10−8 HPO42−(aq) + H2O(l) equilibrium reaction arrow H3O+(aq) + PO43−(aq) Ka3 = 4.8 ✕ 10−13. a.) What is the molarity needed for the acid component of the buffer? b.) What is the molarity needed for the base component of the buffer? c.) How many moles of acid are needed for the buffer? d.) How many moles of base are needed for the buffer? e.) How many grams of acid are needed for the buffer? f.) How many grams of base are needed for the buffer?