Hippuric acid (HC9H8NO3), found in horse urine, has pKa=3.62. Part A Calculate t

Question

Hippuric acid (HC9H8NO3), found in horse urine, has pKa=3.62. Part A Calculate the pH in 0.120 M hippuric acid. Express your answer using three significant figures. pH = 0.934 SubmitMy AnswersGive Up Incorrect; Try Again; 4 attempts remaining Part B Calculate the concentration of H3O+ in 0.120 M hippuric acid. Express your answer to two significant figures and include the appropriate units. SubmitMy AnswersGive Up Part C Calculate the concentration of C9H8NO3 in 0.120 M hippuric acid. Express your answer to two significant figures and include the appropriate units. SubmitMy AnswersGive Up Part D Calculate the concentration of HC9H8NO3 in 0.120 M hippuric acid. Express your answer to two significant figures and include the appropriate units. SubmitMy AnswersGive Up Part E Calculate the concentration of OH in 0.120 M hippuric acid. Express your answer to two significant figures and include the appropriate units. SubmitMy AnswersGive Up Part F Calculate the percent dissociation in 7.50×102 M hippuric acid. Express your answer to two significant figures and include the appropriate units.

Explanation / Answer

Hippuric acid (HC9H8NO3), found in horse urine, has pKa=3.62. Part A Calculate the pH in 0.120 M hippuric acid

pKa = 3.62

Ka = 2.40 x 10^-4

HC9H8NO3    +   H2O    -----------------> C9H8NO3- + H3O+

0.120 M 0 0

0.120 - x x    x

Ka = x^2 / 0.120 - x

2.40 x 10^-4 = x^2 / 0.120 - x

x = 5.25 x 10^-3

[H3O+] = 5.2 x 10^-3 M

pH = -log [H3O+] = -log (5.25 x 10^-3 )

pH = 2.28

[C9H8NO3 ] = 5.2 x 10^-3

[HC9H8NO3 ] = 0.12 M

[OH-] = 1.9 x 10^-12 M

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