Chapter4: Least-squares And Calibration Methods
Section: Chapter Questions
Problem 1P
Related questions
Question
1. Why is there a need to correct conductivity of the sample solution?
2. Cite three possible sources of error in the experiment and discuss their effects on the computed ionization constant of the acetic acid. (See details below----- literature value- Ki, acetic acid= 1.75 x 10^-5).
3. What is the effect of dilution on the fraction of the acetic acid ionized?
![Table 6b.1.
Solution No.
(Blank)
1
2
3
4
5
Final volume, final concentration, corrected conductivity, molar conductivity, and fraction of acetic acid ionized
for each solution.
Solution No.
1
2
3
4
5
Final Volume, mL
60.00
62.00
64.00
66.00
68.00
70.00
Final
Concentration, M
Solution No.
1
2
3
4
5
0.03225806452
0.0625
0.09090909091
0.1176470588
0.1428571429
Table 6b.2. Equilibrium concentration of CH3COOH, CH₂COOO¯, and H3O+ for each solution.
[CH3C000-], M
[CH3COOH], M
0.03152228702
0.06145828066
0.08963337573
0.1162184874
0.1411630848
Acorri μS.cm-¹
Average Ki
Percent Error, %
291
412
501
565
670
pH
3.13
2.98
2.90
2.85
2.77
Ami HS.cm-1. M-1
7.357774969 x 10-4
1.041719343 x 10-³
1.266624273 x 10-³
9020.999999
6592
5511
4802.500001
4689.999834
1.428571429 x 10-³
1.694058095 x 10-³
0.0228091024
0.01666750948
0.01393426043
0.01214285715
0.01185840666
[H3O+], M
Table 6b.3. pH, ionization constant of acetic acid for each solution, and average and percent error of ionization constant.
7.357774969 x 10-4
1.041719343 x 10-³
1.266624273 x 10-³
1.428571429 x 10-³
1.694058095 x 10-³
Ki
1.717415125 x 10-5
1.765716805 x 10-5
1.789888014 x 10-5
1.756016941 x 10-5
2.032991014 x 10-5
1.81 x 10-5
3.57](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F409b9142-20d9-4f17-9785-47022f000408%2Ffe19156d-ecbb-4fb3-921e-33e991a5a382%2Flx0eluj_processed.png&w=3840&q=75)
Transcribed Image Text:Table 6b.1.
Solution No.
(Blank)
1
2
3
4
5
Final volume, final concentration, corrected conductivity, molar conductivity, and fraction of acetic acid ionized
for each solution.
Solution No.
1
2
3
4
5
Final Volume, mL
60.00
62.00
64.00
66.00
68.00
70.00
Final
Concentration, M
Solution No.
1
2
3
4
5
0.03225806452
0.0625
0.09090909091
0.1176470588
0.1428571429
Table 6b.2. Equilibrium concentration of CH3COOH, CH₂COOO¯, and H3O+ for each solution.
[CH3C000-], M
[CH3COOH], M
0.03152228702
0.06145828066
0.08963337573
0.1162184874
0.1411630848
Acorri μS.cm-¹
Average Ki
Percent Error, %
291
412
501
565
670
pH
3.13
2.98
2.90
2.85
2.77
Ami HS.cm-1. M-1
7.357774969 x 10-4
1.041719343 x 10-³
1.266624273 x 10-³
9020.999999
6592
5511
4802.500001
4689.999834
1.428571429 x 10-³
1.694058095 x 10-³
0.0228091024
0.01666750948
0.01393426043
0.01214285715
0.01185840666
[H3O+], M
Table 6b.3. pH, ionization constant of acetic acid for each solution, and average and percent error of ionization constant.
7.357774969 x 10-4
1.041719343 x 10-³
1.266624273 x 10-³
1.428571429 x 10-³
1.694058095 x 10-³
Ki
1.717415125 x 10-5
1.765716805 x 10-5
1.789888014 x 10-5
1.756016941 x 10-5
2.032991014 x 10-5
1.81 x 10-5
3.57
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