In order to determine the Ka of HXO₂, a scientist prepared a HXO₂ solution with a pH=3. If the scientist determined the Ka to be 1.2 X 10⁻⁵, what was the molarity of the acid he started with? (If you use any assumptions, be sure to check that they are valid!)  Round the final answer to the three decimal places.

Chemistry: Principles and Practice
3rd Edition
ISBN:9780534420123
Author:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer
Publisher:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer
Chapter15: Solutions Of Acids And Bases
Section: Chapter Questions
Problem 15.29QE
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In order to determine the Ka of HXO₂, a scientist prepared a HXO₂ solution with a pH=3. If the scientist determined the Ka to be 1.2 X 10⁻⁵, what was the molarity of the acid he started with? (If you use any assumptions, be sure to check that they are valid!)  Round the final answer to the three decimal places. 

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