Calculate [H+] for a 9.00×10-4 M aqueous solution of cinnamic acid (HC9H7O2; Ka = 3.70×10-5).

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
Chapter16: Reactions Between Acids And Bases
Section: Chapter Questions
Problem 16.13QE
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Hello. the answer you provided previously didnt look at the 5% rule. x wouldnt be neglected due to the 5% rule right? so if x wasnt neglected how do i calculate the [H+]?

Calculate [H+] for a 9.00×10-4 M aqueous solution of cinnamic acid (HC9H7O2Ka = 3.70×10-5). 

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