Calculate the pH of a buffer that is 0.185 M in NaHCO3 and 0.250 M in...

Question

Question

Calculate the pH of a buffer that is 0.185 M in NaHCO3 and 0.250 M in Na2CO3.

Answer 1

Answer #1

acid is NaHCO3 and base is Na2CO3.

pKa2 of H2CO3 = 10.33 (Literature value)

Using Henderson equation,

pH = pKa2 + log [salt] / [acid]

or

pH = 10.33 + log (0.250 / 0.185)

or

pH = 10.46 = 10.5 (answer)

Answer 2

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