question archive You need to produce a buffer solution that has a pH of 5
You need to produce a buffer solution that has a pH of 5
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You need to produce a buffer solution that has a pH of 5.05. You already have a solution that contains 10. mmol (millimoles) of acetic acid. How many millimoles of acetate (the conjugate base of acetic acid) will you need to add to this solution? The pKa of acetic acid is 4.74.
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Answer:
pH of acidic buffer = pka+log( H3C-COONa/H3C-COOH)
pka of H3C-COOH = 4.74
NO of mol of H3C-COOna( sodium acetate ) = x mmol
NO of mol of H3C-COOH(acetic acid) = 10 mmol
5.05 = 4.74 +log(x/10)
x = 20.42 mmol
