Solutions of methylene blue is a dark green powder that produces a blue solution when dissolved in water. Based on the UV-vis spectrum for methylene blue above, what wavelength would be optimal for analysis of methylene blue? Why does methylene blue absorb at 665 nm?

Solutions of methylene blue is a dark green powder that produces a blue solution when dissolved in water. Based on the UV-vis spectrum for methylene blue above, what wavelength would be optimal for analysis of methylene blue? Why does methylene blue absorb at 665 nm?

Principles of Instrumental Analysis

7th Edition

ISBN:9781305577213

Author:Douglas A. Skoog, F. James Holler, Stanley R. Crouch

Publisher:Douglas A. Skoog, F. James Holler, Stanley R. Crouch

Chapter19: Nuclear Magnetic Resonance Spectroscopy

Section: Chapter Questions

Problem 19.41QAP

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Question

7.
Absorbance
O
0.8
O
9
N
2
200
300
400
500
600
665 nm
700
Wevelength (nm)
Solutions of methylene blue is a dark green powder that produces a blue solution when
dissolved in water. Based on the UV-vis spectrum for methylene blue above, what
wavelength would be optimal for analysis of methylene blue? Why does methylene blue
absorb at 665 nm?

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