David K.

asked • 10/17/17

Chemistry Paper Chromatography

A chemist wishes to separate and identify a mixture of substances using paper chromatography. The diagram shows the apparatus used. The solvent is water.The solvent front is allowed to reach the top of the paper before the chemist removes the paper from the solvent. Which problem does this cause?
A This causes the spot nearest the bottom of the paper to catch up with the spot above it
B This makes it impossible to calculate the Rf values
C This makes it impossible to use a locating agent
D This results in a safety hazard caused by the solvent fumes

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