Base Base Meid Acid CH3CH2COOH(aq) + H2O()CH3CH2COO(aq) + H30*(aq) 2. Propanoic acid, CH2CH2COOH, is a carboxylic acid that reacts with water according to the equation above. At 25°C the pH of a 50.0 mL sample of 0.20 M CH3CH2COOH is 2.79. (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. (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. A student is given the task of determining the concentration of a propanoic acid solution of unknown concentration. A 0.173 M NaOH solution is available to use as the titrant. The student uses a 25.00 mL volumetric pipet to deliver the propanoic acid solution to a clean, dry flask. After adding an appropriate indicator to the flask, the student titrates the solution with the 0.173 M NaOH, reaching the end point after 20.52 mL of the base solution has been added. (d) Calculate the molarity of the propanoic acid solution. (e) The student is asked to redesign the experiment to determine the concentration of a butanoic acid solution instead of a propanoic acid solution. For butanoic acid the value of pK is 4.83. The student claims that a different indicator will be required to determine the equivalence point of the titration accurately. Based on your response to part (b), do you agree with the student's claim? Justify your answer. a) Acid Base CH₂CH₂OOH CH₂CH₂ COO (c)(i) False because the ratio IJ ratio of CH₂CH₂ COOH and NaOH aren't
Base Base Meid Acid CH3CH2COOH(aq) + H2O()CH3CH2COO(aq) + H30*(aq) 2. Propanoic acid, CH2CH2COOH, is a carboxylic acid that reacts with water according to the equation above. At 25°C the pH of a 50.0 mL sample of 0.20 M CH3CH2COOH is 2.79. (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. (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. A student is given the task of determining the concentration of a propanoic acid solution of unknown concentration. A 0.173 M NaOH solution is available to use as the titrant. The student uses a 25.00 mL volumetric pipet to deliver the propanoic acid solution to a clean, dry flask. After adding an appropriate indicator to the flask, the student titrates the solution with the 0.173 M NaOH, reaching the end point after 20.52 mL of the base solution has been added. (d) Calculate the molarity of the propanoic acid solution. (e) The student is asked to redesign the experiment to determine the concentration of a butanoic acid solution instead of a propanoic acid solution. For butanoic acid the value of pK is 4.83. The student claims that a different indicator will be required to determine the equivalence point of the titration accurately. Based on your response to part (b), do you agree with the student's claim? Justify your answer. a) Acid Base CH₂CH₂OOH CH₂CH₂ COO (c)(i) False because the ratio IJ ratio of CH₂CH₂ COOH and NaOH aren't
Chemistry & Chemical Reactivity
9th Edition
ISBN:9781133949640
Author:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Publisher:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Chapter16: Principles Of Chemical Reactivity: The Chemistry Of Acids And Bases
Section: Chapter Questions
Problem 116IL: Amino acids are an important group of compounds. At low pH, both the carboxylic acid group (CO2H)...
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Transcribed Image Text:Base
Base
Meid
Acid
CH3CH2COOH(aq) + H2O()CH3CH2COO(aq) + H30*(aq)
2. Propanoic acid, CH2CH2COOH, is a carboxylic acid that reacts with water according to the equation above. At
25°C the pH of a 50.0 mL sample of 0.20 M CH3CH2COOH is 2.79.
(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.
(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.
A student is given the task of determining the concentration of a propanoic acid solution of unknown
concentration. A 0.173 M NaOH solution is available to use as the titrant. The student uses a 25.00 mL
volumetric pipet to deliver the propanoic acid solution to a clean, dry flask. After adding an appropriate indicator
to the flask, the student titrates the solution with the 0.173 M NaOH, reaching the end point after 20.52 mL of
the base solution has been added.
(d) Calculate the molarity of the propanoic acid solution.
(e) The student is asked to redesign the experiment to determine the concentration of a butanoic acid solution
instead of a propanoic acid solution. For butanoic acid the value of pK is 4.83. The student claims that a
different indicator will be required to determine the equivalence point of the titration accurately. Based on
your response to part (b), do you agree with the student's claim? Justify your answer.
a)
Acid
Base
CH₂CH₂OOH CH₂CH₂ COO
(c)(i) False because the ratio
IJ
ratio of CH₂CH₂ COOH and NaOH aren't
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