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How can we check that there is no more vanillin left in the organic layer after it has been extracted from a mixed solution of NaOH?

EBK A SMALL SCALE APPROACH TO ORGANIC L

4th Edition

ISBN:9781305446021

Author:Lampman

Publisher:Lampman

Chapter43: Nitration Of Methyl Benzoate

Section: Chapter Questions

Problem 3Q

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What is the purpose of adding sodium sulfate to the organic layer after extraction? A. To remove water from the organic phase B. To act as a base to deprotonate the tannins, making them water soluble C. To act as a base to deprotonate the caffeine, making it water soluble D. To remove organic solvents from the aqueous phase
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