Instrumental acid-base titrations use a pH meter to monitor the changes in pH and volume. The equivalence point is found from the volume at which the curve has the steepest slope.(a) Use Figure to calculate the slope pH/V for all pairs of adjacent points and to calculate the average volume (V(avg)) for each interval.(b) Plot ΔpH/ΔV vs. V(avg) to find the steepest slope, and thus the volume at the equivalence point. (For example, the first pair of points gives ΔpH= 0.22, ΔV=10.00 mL; hence, ΔpH/ΔV=0.022 mL⁻¹, and V(avg)=5.00 mL.) Volume of NaOHadded (mL)Titration of 40.00 mL of 0.1000 M HCIpHwith 0.1000 M NaOH14700.0010.0020.001.001.221.481.852.182.8912-30.0035.0039.00Phenolphthalein10-39.503.2039.7539.9039.9539.993.503.904.208-4.90pH = 7.00 atequivalence point40.0040.017.009.109.8010.1010.5010.796-40.05Methyl red.4-40.1040.2540.502-11.0911.7612.0512.3012.4341.0045.0050.0060.0070.00102030405060708080.0012.52Volume of NaOH added (mL)OH-NaCIH20Total volume (mL)40 + 0 = 4040 + 20 = 6040 + 40 = 8040 + 60 = 100

Answered: Volume of NaOH added (mL) Titration of…

Chemistry: Principles and Practice

3rd Edition

ISBN:9780534420123

Author:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer

Publisher:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer

Chapter16: Reactions Between Acids And Bases

Section: Chapter Questions

Problem 16.54QE

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Instrumental acid-base titrations use a pH meter to monitor the changes in pH and volume. The equivalence point is found from the volume at which the curve has the steepest slope.(a) Use Figure to calculate the slope pH/V for all pairs of adjacent points and to calculate the average volume (V(avg)) for each interval.(b) Plot ΔpH/ΔV vs. V(avg) to find the steepest slope, and thus the volume at the equivalence point. (For example, the first pair of points gives ΔpH= 0.22, ΔV=10.00 mL; hence, ΔpH/ΔV=0.022 mL⁻¹, and V(avg)=5.00 mL.)

Volume of NaOH
added (mL)
Titration of 40.00 mL of 0.1000 M HCI
pH
with 0.1000 M NaOH
147
00.00
10.00
20.00
1.00
1.22
1.48
1.85
2.18
2.89
12-
30.00
35.00
39.00
Phenolphthalein
10-
39.50
3.20
39.75
39.90
39.95
39.99
3.50
3.90
4.20
8-
4.90
pH = 7.00 at
equivalence point
40.00
40.01
7.00
9.10
9.80
10.10
10.50
10.79
6-
40.05
Methyl red.
4-
40.10
40.25
40.50
2-
11.09
11.76
12.05
12.30
12.43
41.00
45.00
50.00
60.00
70.00
10
20
30
40
50
60
70
80
80.00
12.52
Volume of NaOH added (mL)
OH-
Na
CI
H20
Total volume (mL)
40 + 0 = 40
40 + 20 = 60
40 + 40 = 80
40 + 60 = 100

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