Formic acid, HCO2H, is a weak acid (pKa = 3.74). Which of the following bases is sufficiently strong to deprotonate formic acid to an extent greater than 50% (25°C)? (pKp for each base is given) CH3CO2 - (9.24) 103- (13.2) CICH3CO2 (11.1)
Formic acid, HCO2H, is a weak acid (pKa = 3.74). Which of the following bases is sufficiently strong to deprotonate formic acid to an extent greater than 50% (25°C)? (pKp for each base is given) CH3CO2 - (9.24) 103- (13.2) CICH3CO2 (11.1)
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
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Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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Transcribed Image Text:**Formic Acid Deprotonation Problem**
Formic acid, HCO₂H, is a weak acid with a pKₐ of 3.74. The question is to determine which of the following bases can sufficiently deprotonate formic acid to an extent greater than 50% at 25°C. The pK_b values for each base at 25°C are provided:
- CH₃CO₂⁻ (pK_b = 9.24)
- IO₃⁻ (pK_b = 13.2)
- ClCH₃CO₂⁻ (pK_b = 11.1)
**Reminder:** The relationship is given by pKₐ + pK_b = 14.00 at 25°C.
**Options:**
A. ClCH₃CO₂⁻ only
B. CH₃CO₂⁻ only
C. IO₃⁻ only
D. IO₃⁻ and ClCH₃CO₂⁻
To determine the correct answer, compare the pK_b values given with the pKₐ of formic acid, using the provided pKₐ + pK_b relationship. A base is sufficiently strong if 14 minus its pK_b value is greater than the pKₐ of formic acid.
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