Calculate the pH of a 0.400 M solution of phenylacetic acid, for which the K a v

Question

1. 
   Calculate the pH of a 0.400 M solution of phenylacetic acid, for which the Kavalue is 4.90 x 10-5.
2. a. 2.35 b. 5.04 c. 8.96 d. 11.65 e. 4.43 x 10-3

1. 
   Calculate the pH of a 0.400 M solution of phenylacetic acid, for which the Kavalue is 4.90 x 10-5.
2. a. 2.35 b. 5.04 c. 8.96 d. 11.65 e. 4.43 x 10-3

Calculate the pH of a 0.400 M solution of phenylacetic acid, for which the Kavalue is 4.90 x 10-5. Calculate the pH of a 0.400 M solution of phenylacetic acid, for which the Kavalue is 4.90 x 10-5. a. 2.35 b. 5.04 c. 8.96 d. 11.65 e. 4.43 x 10-3 2.35 5.04 8.96 11.65 4.43 x 10-3 a. 2.35 b. 5.04 c. 8.96 d. 11.65 e. 4.43 x 10-3

Explanation / Answer

For weak acid (phenylaceticacid)

pH= 1/2(pKa -logC)

Concentration of acid = 0.4 M

pKa= -logka

= -log 4.90 x 10-5.

= 4.31

pH= 1/2(4.31-log0.4)

= 2.353970004

a. 2.35

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