When calculating [H3O +] for weak acid solutions, we can often use the  x is small  approximation. Explain the nature of this approximation and why it is valid.

Chemistry: Principles and Reactions
8th Edition
ISBN:9781305079373
Author:William L. Masterton, Cecile N. Hurley
Publisher:William L. Masterton, Cecile N. Hurley
Chapter13: Acids And Bases
Section: Chapter Questions
Problem 15QAP: Calculate H+ and OH- and in solutions with the following pH. (a) 9.0(b) 3.20 (c) -1.05 (d) 7.46
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 When calculating [H3O +] for weak acid solutions, we can often use the  x is small  approximation. Explain the nature of this approximation and why it is valid. 

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