Answered: Part A Why can we generally assume that…

Chemistry: Matter and Change

1st Edition

ISBN:9780078746376

Author:Dinah Zike, Laurel Dingrando, Nicholas Hainen, Cheryl Wistrom

Publisher:Dinah Zike, Laurel Dingrando, Nicholas Hainen, Cheryl Wistrom

Chapter18: Acids And Bases

Section: Chapter Questions

Problem 66A: Explain why equilibrium arrows are used in the ionization equations for some acids.

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We can assume the equilibrium concentration is equal to the weak acid's initial concentration by the x is small approximation. Which is most likely to be valid when the equilibirum constant is realtively small (the reaction doesn't procced very far in what ever direction it's going) and the inital concetration is relavitly large (x value is smaller than the intial concentration). You can disregard the x value in the equilibrium constant expression because subtracting or adding the small x does not change the value at all or by that much.

Is what I have so far right?

Part A
Why can we generally assume that the equilibrium concentration of a weak acid equals its initial concentration?

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