In titration we are interested in the equivalence point. Chemically this is when enough of the base has been added to completely neutralize the acid. Graphically this is when the reaction rate begins to decrease. How do we determine the equivalence point from P? Next, how do we determine the equivalence point from P'? What does the data suggest? Estimate the equivalence point with these two approaches using your data and graph.

Chemistry: Matter and Change
1st Edition
ISBN:9780078746376
Author:Dinah Zike, Laurel Dingrando, Nicholas Hainen, Cheryl Wistrom
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Chapter10: The Mole
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Problem 86A
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In titration we are interested in the equivalence point. Chemically this is when enough of the base has been added to completely neutralize the acid. Graphically this is when the reaction rate begins to decrease. How do we determine the equivalence point from P? Next, how do we determine the equivalence point from P'? What does the data suggest? Estimate the equivalence point with these two approaches using your data and graph.

mL of NaOH pH
2.22
5
2.83
3.09
10
3.23
13
3.41
15
3.53
18
3.71
20
3.83
25
4.24
27
4.51
28
4.72
29
5.1
30
10.66
31
11.37
33
11.77
35
11.96
40
12.22
Transcribed Image Text:mL of NaOH pH 2.22 5 2.83 3.09 10 3.23 13 3.41 15 3.53 18 3.71 20 3.83 25 4.24 27 4.51 28 4.72 29 5.1 30 10.66 31 11.37 33 11.77 35 11.96 40 12.22
Titration is a method of chemical analysis in which a reactive substance is slowly added to another
substance, and some property of the combined substance is measured. This procedure is taught in
CHM 116, General Chemistry II.
We will be looking at an example of acid-base titration. Specifically, 25 mL of an unknown
monoprotic weak acid is titrated against 0.105M NaOH (which is a strong base). This means we
are adding the base to the acid using a burette in a slow and precisely controlled manner. We
measure the pH after each addition. (A pH of less than 7 is an acid, and a pH of more than 7 is a
base.)
Transcribed Image Text:Titration is a method of chemical analysis in which a reactive substance is slowly added to another substance, and some property of the combined substance is measured. This procedure is taught in CHM 116, General Chemistry II. We will be looking at an example of acid-base titration. Specifically, 25 mL of an unknown monoprotic weak acid is titrated against 0.105M NaOH (which is a strong base). This means we are adding the base to the acid using a burette in a slow and precisely controlled manner. We measure the pH after each addition. (A pH of less than 7 is an acid, and a pH of more than 7 is a base.)
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