A student removed the chromatogram in the upper image from the development chamber and allowed the solvent to dry. What did he forget to do?
Answer
The student forgot to trace the solvent front before allowing the solvent to dry on the chromatogram. No Rf values can be calculated from this chromatogram.
The chromatogram in the lower image was spotted with three samples: Sample 1, Sample 2, and Sample 3. What conclusions can be drawn about the components of Sample 3?
Answer
Sample 3 is composed of at least two different compounds, one of which is probably the same as Sample 1. Sample 3 does not contain any of Sample 2, but does contain another component which is not Sample 1 or Sample 2.
A student removed the chromatogram in the upper image from the development chamber and allowed the solvent to dry. What did he forget to do?