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Make 350 mL of 43 mM sodium phosphate buffer, pH 7.0 without titrating with NaOH or...

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Chemistry

Make 350 mL of 43 mM sodium phosphate buffer, pH 7.0 withouttitrating with NaOH or HCI. Show your calculations, which 2 speciesof sodium phosphate you choose (species are H3PO4, NaH2PO4,Na2HPO4, and Na3PO4; dissociation pKa’s are 2.16, 7.21, and 12.32),and how much of each you weighed out. Check and read your finalpH.

Answer & Explanation Solved by verified expert
3.9 Ratings (750 Votes)
i Following are the dissociation equilibriums of H3PO4 H3PO4aq H2Ol H2PO4aq H3Oaq pKa1 216 H2PO4aq H2Ol HPO42aq H3Oaq pKa2 721 HPO42aq H2Ol PO43aq H3Oaq pKa3 1232 target pH 70 is near to pK2 so the required species are H2PO4 and    See Answer
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