Ka for ethanoic acid is 1.7*10^-5 moldm-3. Show by calculation that the initial pH in experiment B is 4.8.

Principles of Modern Chemistry
8th Edition
ISBN:9781305079113
Author:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler
Publisher:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler
Chapter15: Acid–base Equilibria
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Ka for ethanoic acid is 1.7*10^-5 moldm-3.

Show by calculation that the initial pH in experiment B is 4.8. 

 

3 A group of students are investigating the properties of weak acids and buffer solutions.
They take measurements of the pH of some solutions before and after adding an equal volume of
0.01 moldm-3 sodium hydroxide solution.
Some of the students' results are shown in the table below.
Experiment
Original solution
pH before addition
pH after addition
A
0.01 mol dm-3 ethanoic acid
3.4
8.2
0.1 moldm-3 ethanoic acid
plus an equal volume of
0.1 mol dm-3 sodium ethanoate
B
4.8
4.9
0.1 mol dm-3 sodium ethanoate
8.9
11.7
D
Distilled water
7.0
Transcribed Image Text:3 A group of students are investigating the properties of weak acids and buffer solutions. They take measurements of the pH of some solutions before and after adding an equal volume of 0.01 moldm-3 sodium hydroxide solution. Some of the students' results are shown in the table below. Experiment Original solution pH before addition pH after addition A 0.01 mol dm-3 ethanoic acid 3.4 8.2 0.1 moldm-3 ethanoic acid plus an equal volume of 0.1 mol dm-3 sodium ethanoate B 4.8 4.9 0.1 mol dm-3 sodium ethanoate 8.9 11.7 D Distilled water 7.0
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