4. When 0.050 mol of NaOH is added to 0.100 mol of an unknown weak acid, the pH was found to be 4.2. Which of the following can be the acid? (A) Chlorous acid (B) Nitrous acid K₂=1 x 10-² K₁ = 4 x 104 K₁ = 6 x 10-5 10-8 (C) Benzoic acid (D) Hypochlorous acid K₂=4 × Ka

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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4. When 0.050 mol of NaOH is added to 0.100 mol of an
unknown weak acid, the pH was found to be 4.2. Which
of the following can be the acid?
(A) Chlorous acid
K₂ = 1 × 10-²
(B) Nitrous acid
K₁ = 4 x 10-4
(C) Benzoic acid
K₁ = 6 × 10-5
(D) Hypochlorous acid K₁=4 × 10-8
Transcribed Image Text:4. When 0.050 mol of NaOH is added to 0.100 mol of an unknown weak acid, the pH was found to be 4.2. Which of the following can be the acid? (A) Chlorous acid K₂ = 1 × 10-² (B) Nitrous acid K₁ = 4 x 10-4 (C) Benzoic acid K₁ = 6 × 10-5 (D) Hypochlorous acid K₁=4 × 10-8
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