Separating techniques - Chromatography
Someone has written rude words in graffiti ink all over the back bench in the Science
classroom where three students usually sit. Miss has said the whole class will forfeit
their lunchtime unless you can find out who the culprit is.
Your task is to plan a detailed investigation into the colours in the graffiti ink and the ink
used by the culprits to find out whose ink wrote the graffiti
You should include:
a List of apparatus required
description of the method used
a labelled diagram of your results
any hazards or risks
a conclusion and evaluation
.
Keywords: soluble solvent chromatography chromatogram separate mixtures colours
To get a higher
mark:
You need to have:
.
.
.
.
Described a method of separation of ink using most of the key words.
Drawn and labelled a diagram of results.
Conducted a full risk assessment.
Described how chromatography is useful
Explained your results and drawn a conclusion
Explained how chromatography works and the uses of chromatography
Explained your choice of separation technique, stating other types of separation
techniques
Suggested any possible problems with the method or in using the results.
• Suggested how the investigation could have been improved.
Compared the distance moved and Rf values for the different pigments in different
solvents and used this data to draw conclusions
Evaluated how good the evidence was in supporting the conclusion