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 Reactions

8th Edition

ISBN:9781305079373

Author:William L. Masterton, Cecile N. Hurley

Publisher:William L. Masterton, Cecile N. Hurley

Chapter14: Equilibria In Acid-base Solutions

Section: Chapter Questions

Problem 70QAP: Consider the titration of HF (K a=6.7104) with NaOH. What is the pH when a third of the acid has...

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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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