(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)
11th Edition
ISBN:9781305580343
Author:Steven D. Gammon, Ebbing, Darrell Ebbing, Steven D., Darrell; Gammon, Darrell Ebbing; Steven D. Gammon, Darrell D.; Gammon, Ebbing; Steven D. Gammon; Darrell
Publisher:Steven D. Gammon, Ebbing, Darrell Ebbing, Steven D., Darrell; Gammon, Darrell Ebbing; Steven D. Gammon, Darrell D.; Gammon, Ebbing; Steven D. Gammon; Darrell
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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