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High pH buffer

Prepare 0.1M solutions of sodium carbonate (Na2CO3·10H2O) (28.62g/l) and sodium hydrogen carbonate (NaHCO3) (8.4g/l)
Mix these in the volumes shown in the table.
    pH Volume of 0.1M Na2CO3 (cm3) Volume of 0.1M NaHCO3 (cm3)
    at 20°C at 37°C
    9.2 8.8 10 90
    9.4 9.1 20 80
    9.5 9.4 30 70
    9.8 9.5 40 60
    9.9 9.7 50 50
    10.1 9.9 60 40
    10.3 10.1 70 30
    10.5 10.3 80 20
    10.8 10.6 90 10
    Delroy & King, Biochem. J. 39, 245 (1945)

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