3. How will you prepare 500 ml of 0.750 M citrate buffer with pH of 4.25 from solid citric acid (C6H8O7) and solid sodium citrate (Na3C6H5O7). The Ka of citric acid is 7.40 x 10-4 .  Given: • (Na3C6H5O7) solid sodium citrate = conjugate base in molarity [? −] • (C6H8O7) solid citric acid = weak acid in molarity [??] • 7.40 × 10−4 ?? of citric acid = ??? (acid-dissociation constant) • 500 ml of 0.750 M citrate buffer

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