The equilibrium constant for the reaction 2CrO,2 + 2H → Cr,0;² + H,O is 4.1x1011. The molar absorptivities for the two principal species in a solution of K2Cr,07 are: E1 (CrOa?) E2 (Cr20,") 345 1.84 x 103 10.7 x 10? 370 4.81 x 103 7.28 x 10? 400 1.88 x 103 1.89 x 10?
The equilibrium constant for the reaction 2CrO,2 + 2H → Cr,0;² + H,O is 4.1x1011. The molar absorptivities for the two principal species in a solution of K2Cr,07 are: E1 (CrOa?) E2 (Cr20,") 345 1.84 x 103 10.7 x 10? 370 4.81 x 103 7.28 x 10? 400 1.88 x 103 1.89 x 10?
Chemistry for Engineering Students
4th Edition
ISBN:9781337398909
Author:Lawrence S. Brown, Tom Holme
Publisher:Lawrence S. Brown, Tom Holme
Chapter12: Chemical Equilibrium
Section: Chapter Questions
Problem 12.53PAE: The ore cinnabar (HgS) is an important source of mercury. Cinnabar is a red solid whose solubility...
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USE THE DATA BELOW ON MOLAR ABSORPTIVITIES FOR THE TWO PRINCIPAL SPECIES IN A SOLUTION OF POTASSIUM DICHROMATE. Four solutions were prepared by dissolving 3.50 x 10^-4 , 3.00 x 10^-4, 2.50 x 10^-4, and 2.00 x 10^-4 moles of K2Cr2O7 in water and diluting to 1.0 L with a pH of 5.55 buffer. Derive theoretical absorbance values using a 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:The equilibrium constant for the reaction
2CrO,2 + 2H → Cr,0;² + H,O
is 4.1x1011. The molar absorptivities for the two principal species in a solution of K2Cr,07 are:
E1 (CrOa?)
E2 (Cr20,")
345
1.84 x 103
10.7 x 10?
370
4.81 x 103
7.28 x 10?
400
1.88 x 103
1.89 x 10?
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