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Given that the stepwise dissociation constants for phosphoric acid are: Ka1 = 7.5×10-3; Ka2 = 6.2×10-8;...

Given that the stepwise dissociation constants for phosphoric acid are:

Ka1 = 7.5×10-3; Ka2 = 6.2×10-8; Ka3 = 4.8×10-13

To prepare 1.20 L of a buffer solution having an ionic strength of 0.150 and a pH of 7.50 would require:

Answer to 3 sig figs.

a) (mass) of Na2HPO4(anhydrous) and

b) (mass) of NaH2PO4(anhydrous).

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