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1. If you are to make 1 L of a 0.1 M H2PO4- / HPO42- (pKa2...

1. If you are to make 1 L of a 0.1 M H2PO4- / HPO42- (pKa2 = 6.9) buffer at pH 6.9 and you start with the NaH2PO4, how many grams of NaH2PO4 is needed? Do you then add HCl or NaOH to make the final buffer and how moles of HCl or NaOH is needed? MW for NaH2PO4 is 120.

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