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The equilibrium constant for the reaction 2CrO,- + 2H* = Cr,0,²- + H,O is 4.2 × 1014. The molar absorptivities for the two principal species in a solution of K,CrO, are A, nm E, (CrO,²-) E2 (Cr,O,²-) 1.84 X 10³ 4.81 × 103 1.88 × 103 10.7 × 10² 7.28 × 10² 1.89 X 10² 345 370 400 Four solutions were prepared by dissolving 4.00 × 10-4, 3.00 × 10-4, 2.00 × 10-4, and 1.00 × 10¬4 moles of K,Cr,O, in water and diluting to 1.00 L with a pH 5.60 buffer. Calculate theoretical absorbance values (1.00-cm cells) for each solution and plot the data for (a) 345 nm; (b) 370 nm; and (c) 400 nm.

The equilibrium constant for the reaction 2CrO,- + 2H* = Cr,0,²- + H,O is 4.2 × 1014. The molar absorptivities for the two principal species in a solution of K,CrO, are A, nm E, (CrO,²-) E2 (Cr,O,²-) 1.84 X 10³ 4.81 × 103 1.88 × 103 10.7 × 10² 7.28 × 10² 1.89 X 10² 345 370 400 Four solutions were prepared by dissolving 4.00 × 10-4, 3.00 × 10-4, 2.00 × 10-4, and 1.00 × 10¬4 moles of K,Cr,O, in water and diluting to 1.00 L with a pH 5.60 buffer. Calculate theoretical absorbance values (1.00-cm cells) for each solution and plot the data for (a) 345 nm; (b) 370 nm; and (c) 400 nm.

Chemistry
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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24-29. The equilibrium constant for the reaction 2CrO- + 2H*= Cr,0,²- + H,O is 4.2 × 1014. The molar absorptivities for the two principal species in a solution of K,CrO7 are A, nm ɛ, (CrO,²¯) E2 (Cr,0,²-) 10.7 × 10² 7.28 × 10² 1.89 X 10² 345 1.84 X 10 4.81 × 10³ 1.88 X 103 370 400 Four solutions were prepared by dissolving 4.00 × 10-4, 3.00 X 10-4, 2.00 × 10-4, and 1.00 × 10¬4 moles of K,Cr,O, in water and diluting to 1.00 L with a pH 5.60 buffer. Calculate theoretical absorbance values (1.00-cm cells) for each solution and plot the data for (a) 345 nm; (b) 370 nm; and (c) 400 nm.
Transcribed Image Text:24-29. The equilibrium constant for the reaction 2CrO- + 2H*= Cr,0,²- + H,O is 4.2 × 1014. The molar absorptivities for the two principal species in a solution of K,CrO7 are A, nm ɛ, (CrO,²¯) E2 (Cr,0,²-) 10.7 × 10² 7.28 × 10² 1.89 X 10² 345 1.84 X 10 4.81 × 10³ 1.88 X 103 370 400 Four solutions were prepared by dissolving 4.00 × 10-4, 3.00 X 10-4, 2.00 × 10-4, and 1.00 × 10¬4 moles of K,Cr,O, in water and diluting to 1.00 L with a pH 5.60 buffer. Calculate theoretical absorbance values (1.00-cm cells) for each solution and plot the data for (a) 345 nm; (b) 370 nm; and (c) 400 nm.
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