A. The pKa\'s of trichloroacetic acid, dichloroacetic acid, chloroacetic acid an

Question

A. The pKa's of trichloroacetic acid, dichloroacetic acid, chloroacetic acid and acetic acid are 0.66, 1.35, 2.86 and 4.76. Which is the strongest acid, and why?
B, What is the pH of a 0.020 M solution of a weak, monoprotic acid with a pKa of 6.6? A. The pKa's of trichloroacetic acid, dichloroacetic acid, chloroacetic acid and acetic acid are 0.66, 1.35, 2.86 and 4.76. Which is the strongest acid, and why?
B, What is the pH of a 0.020 M solution of a weak, monoprotic acid with a pKa of 6.6?
B, What is the pH of a 0.020 M solution of a weak, monoprotic acid with a pKa of 6.6?

Explanation / Answer

A)

Due to higher electronegativity of -Cl, -CCl3 have strong -I effect. With increasing the number of -Cl, the -I effect increases. With increasing the -I effect, the electron density on the -CO2H group decreases and hence acidity increases.

so trichloroacetic acid is the strongest acid.

B)

for weak acid,

PH = 0.5 * PKa - 0.5 *log C

PH = 0.5 * 6.6 - 0.5 * log (0.020)

PH = 3.3 + 0.85

PH = 4.15

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