AgNO3 2 K2Cr2O7 + 8 H2SO4 + 3 CH3CH2OH → 2 Cr2(SO4)3 + 2 K2SO4 + 3 CH3COOH + 11 H2O 1)2)3)4)Most sugars can act as reducing agents. Could the dichromate reaction shown in equation (1) beused to determine the alcohol concentration in beer? Why or why not?If an ethanol solution with a concentration of 0.435M is reacted with dichromate as in equation(1) and the resulting solution has an absorbance of 0.85 at 580nm, estimate the value of theconstant, K, in equation (2). Be sure to include units.What would be the concentration of the solution in question 2 expressed in units of g/dl? Themolecular weight of ethanol is 46g/mol.If the path length (see the Spectroscopy and Concentration Reference Sheet) was doubled, wouldthe absorbance be doubled or halved?

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Answered: 1) Most sugars can act as reducing…

1) Most sugars can act as reducing agents. Could the dichromate reaction shown in equation (1) be used to determine the alcohol concentration in beer? Why or why not?

Organic Chemistry: A Guided Inquiry

2nd Edition

ISBN:9780618974122

Author:Andrei Straumanis

Publisher:Andrei Straumanis

Chapter12: Chirality

Section: Chapter Questions

Problem 10CTQ

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Question

AgNO₃

2 K₂Cr₂O₇ + 8 H₂SO₄ + 3 CH₃CH₂OH → 2 Cr₂(SO₄)₃ + 2 K₂SO₄ + 3 CH₃COOH + 11 H₂O

1)
2)
3)
4)
Most sugars can act as reducing agents. Could the dichromate reaction shown in equation (1) be
used to determine the alcohol concentration in beer? Why or why not?
If an ethanol solution with a concentration of 0.435M is reacted with dichromate as in equation
(1) and the resulting solution has an absorbance of 0.85 at 580nm, estimate the value of the
constant, K, in equation (2). Be sure to include units.
What would be the concentration of the solution in question 2 expressed in units of g/dl? The
molecular weight of ethanol is 46g/mol.
If the path length (see the Spectroscopy and Concentration Reference Sheet) was doubled, would
the absorbance be doubled or halved?

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