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CHEM EQB

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How many ml of 0.2M NaH2PO4 should b added to 40 mL of 0.1M Na3PO4 to make the buffer pH 7.2.
Ka1:1.1 x 10^-2
Ka2:7.5 x 10^-8
Ka3:4.8 x 10^-13

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