On a shelf in the lab storeroom marked “Solutions of Acids”, a bottle has a torn label. All that can be seen on the label is the concentration:  643 x 10-3 M, not the name of the acid.  In trying to find the identity of the acid, you measure the pH of this solution and find it to be 3.382.

Introductory Chemistry: A Foundation
8th Edition
ISBN:9781285199030
Author:Steven S. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Donald J. DeCoste
Chapter16: Acids And Bases
Section: Chapter Questions
Problem 42QAP
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  1. On a shelf in the lab storeroom marked “Solutions of Acids”, a bottle has a torn label. All that can be seen on the label is the concentration:  643 x 10-3 M, not the name of the acid.  In trying to find the identity of the acid, you measure the pH of this solution and find it to be 3.382.

Of the acids listed on the chart of Acid Dissociation Constants (attached), WHICH ACID could this be? 

There is only one correct answer. Hint:  Use the given information to find Ka.  Use all sig figs in the pH.

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