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Calculate the pH of a buffer solution ?

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Calculate the pH of a buffer solution prepared by mixing 400. mL of 0.100M CH3COOH and 200. mL of 0.100 M NaCH3COO?

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  1. Use the Henderson-Hasselbalch equation-

    pH = pKa + log(A-/HA)

    Ka = 1.75x10^-5

    pKa = 4.76

    pH = pKa + log(A-/HA) = pKa + log(0.0333/0.0667)

    pH = pKa -0.30

    pKa of CH3COOH = 4.76

    pH = 4.76 - 0.30 = 4.46

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