Ap Chem Acid Base Worksheet Page 6
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77.
Propanoic acid, CH
CH
COOH, is a carboxylic acid that reacts with water according to the
3
2
equation above. At 25
C the pH of a 50.0 mL sample of 0.20 M CH
CH
COOH is 2.79.
o
3
2
(a) Identify a Brønsted-Lowry conjugate acid-base pair in the reaction. Clearly label which is the
acid and which is the base.
(b) Determine the value of Ka for propanoic acid at 25
C.
o
(c) For each of the following statements, determine whether the statement is true or false. In
each case, explain the reasoning that supports your answer.
(i) The pH of a solution prepared by mixing the 50.0 mL sample of 0.20 M
CH3CH2COOH
with a 50.0 mL sample of 0.20 M NaOH is 7.00.
(ii) If the pH of a hydrochloric acid solution is the same as the pH of a propanoic acid
solution, then the molar concentration of the hydrochloric acid solution must be less than
the molar concentration of the propanoic acid solution.
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