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1 Esters can be used as solvents in chromatography. The following shows a chromatogram of plant acids. solvent front the cross represents the centre of the spot baseline sample sample 2 An ester was used as the solvent and the chromatogram was sprayed with bromothymol blue. (1) Suggest why it was necessary to spray the chromatogram. [2] (ii) Explain what is meant by the Rf value of a sample.

1 Esters can be used as solvents in chromatography. The following shows a chromatogram of plant acids. solvent front the cross represents the centre of the spot baseline sample sample 2 An ester was used as the solvent and the chromatogram was sprayed with bromothymol blue. (1) Suggest why it was necessary to spray the chromatogram. [2] (ii) Explain what is meant by the Rf value of a sample.

Chemistry
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
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Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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1 Esters can be used as solvents in chromatography. The following shows a chromatogram of plant acids. solvent front the cross represents the centre of the spot baseline sample sample 2 An ester was used as the solvent and the chromatogram was sprayed with bromothymol blue. (1) Suggest why it was necessary to spray the chromatogram. [2] (ii) Explain what is meant by the Rf value of a sample.
Transcribed Image Text:1 Esters can be used as solvents in chromatography. The following shows a chromatogram of plant acids. solvent front the cross represents the centre of the spot baseline sample sample 2 An ester was used as the solvent and the chromatogram was sprayed with bromothymol blue. (1) Suggest why it was necessary to spray the chromatogram. [2] (ii) Explain what is meant by the Rf value of a sample.
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