(a) Calculate the [H30+] for each buffer solution and enter the value in Table D. Use the formula [H30+] = 10-pH, (Hint: The answer should contain two significant figures. This is the appropriate value when taking B.AA to the power of 10. The number of places after the decimal point, represented by A and A, determines the number of significant figures, Values before the decimal, represented by B, simply become part of the exponent of 10. So 10B.AA becomes .A x 108.) Table D: Calculation of Equilibrium Constant [BB"] from absorbance Measured absorbance at at v635 nm [HBB] from corrected Buffer [H30+] (a) Approximate Keg (c) pKeg (d) pH 470 nm absorbance at 470 nm (in-Lab Data Table C) (in-Lab Data Table C) (b) 6.30 4.0 4.0 49 40.1450 4 3528 4 .3238 5.0е-7 1.8e-7 4.0) 1.6e-7 6.80 4.0 4.0 403970 40.1866 4 .1072 2.3e-7 7.30 4.0 4.0 4.0 5.0e-7 4 .2362 4 2362 .1145 1.8e-7 too high Average pkeg (e) 4.0 Standard Deviation of pKeg (e) 4.0 Percent Standard Deviation of pKeg (e) 4.0 % (b) Reenter the measured absorbance at 635 nm from Table C of the lab. This is the [BB-), Reenter the measured absorbance at 470 nm from Table C of the Lab. Use the formula below to correct the absorbance at w470 nm and enter the calculated values in Table D as the [HBB]. (Additional Info) (HBB] = Absorbance470 - (0.2 x Absorbances35) %3D
(a) Calculate the [H30+] for each buffer solution and enter the value in Table D. Use the formula [H30+] = 10-pH, (Hint: The answer should contain two significant figures. This is the appropriate value when taking B.AA to the power of 10. The number of places after the decimal point, represented by A and A, determines the number of significant figures, Values before the decimal, represented by B, simply become part of the exponent of 10. So 10B.AA becomes .A x 108.) Table D: Calculation of Equilibrium Constant [BB"] from absorbance Measured absorbance at at v635 nm [HBB] from corrected Buffer [H30+] (a) Approximate Keg (c) pKeg (d) pH 470 nm absorbance at 470 nm (in-Lab Data Table C) (in-Lab Data Table C) (b) 6.30 4.0 4.0 49 40.1450 4 3528 4 .3238 5.0е-7 1.8e-7 4.0) 1.6e-7 6.80 4.0 4.0 403970 40.1866 4 .1072 2.3e-7 7.30 4.0 4.0 4.0 5.0e-7 4 .2362 4 2362 .1145 1.8e-7 too high Average pkeg (e) 4.0 Standard Deviation of pKeg (e) 4.0 Percent Standard Deviation of pKeg (e) 4.0 % (b) Reenter the measured absorbance at 635 nm from Table C of the lab. This is the [BB-), Reenter the measured absorbance at 470 nm from Table C of the Lab. Use the formula below to correct the absorbance at w470 nm and enter the calculated values in Table D as the [HBB]. (Additional Info) (HBB] = Absorbance470 - (0.2 x Absorbances35) %3D
General Chemistry - Standalone book (MindTap Course List)
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Author:Steven D. Gammon, Ebbing, Darrell Ebbing, Steven D., Darrell; Gammon, Darrell Ebbing; Steven D. Gammon, Darrell D.; Gammon, Ebbing; Steven D. Gammon; Darrell
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Chapter16: Acid-base Equilibria
Section: Chapter Questions
Problem 16.130QP: Malic acid is a weak diprotic organic acid with Ka1 = 4.0 104 and Ka2 = 9.0 105. a Letting the...
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n the rest of the table? How do I solve the other blanks? This is from a post lab:
![(a) Calculate the [H30+] for each buffer solution and enter the value in Table D. Use the formula [H;0+] = 10-PH. (Hint: The answer should contain twvo significant
figures. This is the appropriate value when taking B.AA to the power of 10. The number of places after the decimal point, represented by A and A, determines the
number of significant figures, Values before the decimal, represented by B, simply become part of the exponent of 10. So 10B.AA becomes A.A x 1oB.)
Table D: Calculation of Equilibrium Constant
Buffer
Measured absorbance at
[H30+]
(a)
[BB"] from absorbance
at N635 nm
(in-Lab Data Table C)
[HBB] from corrected
absorbance at 470 nm
Approximate
Keg
(c)
pKeg
(d)
pH
N470 nm
(in-Lab Data Table C)
(ь)
6.30
4.0
4.0
4.0
.1450
4.0
49.3528
40.3238
5.0e-7
1.8e-7
6.80
4.0
4.0
4.0
40.3970
40.1866
40.1072
1.6e-7
2.3e-7
7.30
40
4.0
4.0
5.0e-7
4 .2362
40
.2362
1.1145
1.8e-7
too high
Average pkeg
(e)
Standard Deviation of pK eg
4.0
(e)
Percent Standard Deviation of pkeg
40
(e)
%
(b) Reenter the measured absorbance at 635 nm from Table C of the lab. This is the [BB-]. Reenter the measured absorbance at 470 nm from Table C of the Lab.
Use the formula below to correct the absorbance at 470 nm and enter the calculated values in Table D as the [HBB]. (Additional Info)
[HBB] = Absortance470 - (0.2 x Absorbance63s)](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fc5f81d2c-6cc2-4fbe-a7b6-26f56b17e4d5%2F725fc1d3-d509-48aa-89ca-abf3b66c3d4b%2F3w8wmjs_processed.jpeg&w=3840&q=75)
Transcribed Image Text:(a) Calculate the [H30+] for each buffer solution and enter the value in Table D. Use the formula [H;0+] = 10-PH. (Hint: The answer should contain twvo significant
figures. This is the appropriate value when taking B.AA to the power of 10. The number of places after the decimal point, represented by A and A, determines the
number of significant figures, Values before the decimal, represented by B, simply become part of the exponent of 10. So 10B.AA becomes A.A x 1oB.)
Table D: Calculation of Equilibrium Constant
Buffer
Measured absorbance at
[H30+]
(a)
[BB"] from absorbance
at N635 nm
(in-Lab Data Table C)
[HBB] from corrected
absorbance at 470 nm
Approximate
Keg
(c)
pKeg
(d)
pH
N470 nm
(in-Lab Data Table C)
(ь)
6.30
4.0
4.0
4.0
.1450
4.0
49.3528
40.3238
5.0e-7
1.8e-7
6.80
4.0
4.0
4.0
40.3970
40.1866
40.1072
1.6e-7
2.3e-7
7.30
40
4.0
4.0
5.0e-7
4 .2362
40
.2362
1.1145
1.8e-7
too high
Average pkeg
(e)
Standard Deviation of pK eg
4.0
(e)
Percent Standard Deviation of pkeg
40
(e)
%
(b) Reenter the measured absorbance at 635 nm from Table C of the lab. This is the [BB-]. Reenter the measured absorbance at 470 nm from Table C of the Lab.
Use the formula below to correct the absorbance at 470 nm and enter the calculated values in Table D as the [HBB]. (Additional Info)
[HBB] = Absortance470 - (0.2 x Absorbance63s)
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