RoseMarie Gallagher and Paul Ingram Solutions for Chapter: Separating Substances, Exercise 6: Checkup on Chapter 2

A mixture of salt and sugar has to be separated, using the solvent ethanol. Draw a diagram of the apparatus used in the experiment of obtaining sugar crystals from the sugar solution, without losing the ethanol.

In a chromatography experiment, eight coloured substances were spotted on a piece of filter paper. Three were the basic coloured red, blue and yellow. The other was unknown substances, labelled A-E. This shows the resulting chromatogram :

Which one of substance A-E contains only one basic colour?

In a chromatography experiment, eight coloured substances were spotted onto a piece of filter paper. Three were the basic coloured red, blue and yellow. The other were unknown substances, labelled A-E. This shows the resulting chromatogram :

Which contains all three basic colours?

In a chromatography experiment, eight coloured substances were spotted on a piece of filter paper. Three were the basic coloured red, blue and yellow. The other was unknown substances, labelled A-E. This shows the resulting chromatogram :

The solvent was propanone. Which of the three basic colours are the most soluble in propanone?

The diagram below shows a chromatogram for a mixture of amino acids. 

The solvent was a mixture of water, butanol and ethanoic acid. Using the table of ${\mathrm{R}}_{\mathrm{f}}$values given, identify the two amino acids.

The diagram below shows a chromatogram for a mixture of amino acids.

The solvent was a mixture of water, butanol and ethanoic acid. Which of them is less soluble in the solvent?

The diagram below shows a chromatogram for a mixture of amino acids. 

The solvent was a mixture of water, butanol and ethanoic acid. How will the ${\mathrm{R}}_{\mathrm{f}}$values change if the solvent travels only $6$cm?

You have three colourless solutions. Each contains an amino acid you must identify. Explain how to do this using chromatography. Use the term ${\mathrm{R}}_{\mathrm{f}}$and locating agent in your answer, and show that you understand what they mean.