Calculation of Molar Ratios of Conjugate Base to Weak Acid from pH For a weak acid...

Calculation of Molar Ratios of Conjugate Base to Weak Acid from pH For a weak acid with a pKa of 6.0, calculate the ratio of conjugate base to acid at a pH of 5.0.

Choice of Weak Acid for a Buffer Which of these com-pounds would be the best buffer at pH 5.0: formic acid (pKa 5 3.8), acetic acid (pKa 5 4.76), or ethylamine (pKa 5 9.0)? Briefly justify your answer.

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Expert Solution

pH = pKa + log(salt/acid)

pH = pKa + log(conjugate base/acid)

5.0 = 6.0 + log(conjugate base/acid)

log(conjugate base/acid) = 5.0-6.0

= -1.0

(conjugate base/acid) = 10^-1.0

= 0.1

queen_honey_blossom answered 2 years ago

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