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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).

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ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
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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?
Transcribed Image Text: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?
Expert Solution
Step 1 Malachite green and Rhodamine6G

Malachite green (a.k.a. basic green 4) Rhodamine6G (a.k.a. basic red 1) , both are organic dyes. 

Malachite green belongs to triphenylmethane group.

Rhodamine6G (a.k.a. basic red 1) belongs to xanthene group

Both dyes are in the from of salt and water soluble

Both dyes belongs to different group, so they differ in their relative polarities.

 

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