1. Many dyes and pigments are organic molecules which vary in their relative polarities. Look up and draw the structures of two water-soluble dyes: malachite green (a.k.a. basic green 4) and rhodamine 6G (a.k.a. basic red 1).

1. Many dyes and pigments are organic molecules which vary in their relative polarities. Look up and draw the structures of two water-soluble dyes: malachite green (a.k.a. basic green 4) and rhodamine 6G (a.k.a. basic red 1).

Fundamentals Of Analytical Chemistry

9th Edition

ISBN:9781285640686

Author:Skoog

Publisher:Skoog

Chapter29: Mass Spectrometry

Section: Chapter Questions

Problem 29.12QAP

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Concept explainers

Applications of Molecular Spectroscopy

When light sources pass through the diffraction grating then light splits into different wavelengths. The light source produces two types of patterns that are shown as destructive and non-destructive. The light source is in the form of quanta that is quantitation.

Question

I have the chemical structures drawn out. I am struggling with which are polar and why they are. Which would have the greatest Rfactor and why based on looking at molecular structure and your knowledge And if you added a non polar solvent to each repeatedly what would happen to the Rfactor.

1. Many dyes and pigments are organic molecules which vary in their relative polarities. Look
up and draw the structures of two water-soluble dyes: malachite green (a.k.a. basic green 4)
and rhodamine 6G (a.k.a. basic red 1).
2. If you ran a chromatogram comparing these two dyes with water as the solvent, which would
you expect to have a higher Rf value (travel further)? Why?
3. What would happen to the Rr values of these dyes if you ran several chromatograms using
solvents of decreasing polarity? Why?

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