You discover a beaker of an unknown acid in the laboratory. A concentration label of "0.10 M" isscribbled on the side of the beaker with a marker. You review your chemical inventory of acids andrecord that you currently have the following acids in your inventory.Acid (in your inventory)KaHydrochloric acid>1Nitrous acid4.5x104Acetic acid1.8x105Hypochlorous acid3.0 x108Phenol1.3x10-10You then measure the pH of the unknown acid to be 4.26. What is the identity of this acid?A. Hydrochloric acidB. Nitrous acidC. Acetic acidD. Hypochlorous acidE. Phenol

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Chemistry: The Molecular Science

5th Edition

ISBN:9781285199047

Author:John W. Moore, Conrad L. Stanitski

Publisher:John W. Moore, Conrad L. Stanitski

Chapter3: Chemical Reactions

Section3.4: Acid-base Reactions

Problem 3.6E

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Question

You discover a beaker of an unknown acid in the laboratory. A concentration label of "0.10 M" is
scribbled on the side of the beaker with a marker. You review your chemical inventory of acids and
record that you currently have the following acids in your inventory.
Acid (in your inventory)
Ka
Hydrochloric acid
>1
Nitrous acid
4.5x104
Acetic acid
1.8x105
Hypochlorous acid
3.0 x108
Phenol
1.3x10-10
You then measure the pH of the unknown acid to be 4.26. What is the identity of this acid?
A. Hydrochloric acid
B. Nitrous acid
C. Acetic acid
D. Hypochlorous acid
E. Phenol

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