1. The pka for benzoic acid is 4.2. Show mathematically that this acid is 50% ionized at pH 4.2. 2. Use the result from Q1 to explain why precipitation of benzoic acid is incomplete if the pH of an aqueous solution of benzoate ion is lowered only to pH 7 by adding acid.

1. The pka for benzoic acid is 4.2. Show mathematically that this acid is 50% ionized at pH 4.2. 2. Use the result from Q1 to explain why precipitation of benzoic acid is incomplete if the pH of an aqueous solution of benzoate ion is lowered only to pH 7 by adding acid.

Organic Chemistry

9th Edition

ISBN:9781305080485

Author:John E. McMurry

Publisher:John E. McMurry

Chapter20: Carboxylic Acids And Nitriles

Section20.3: Biological Acids And The Henderson–hasselbalch Equation

Problem 5P: Calculate the percentages of dissociated and undissociated forms present in the following solutions:...

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Step 1: Given data and the equation for ionization

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