There are a number of ways that you could investigate the composition of inks in Chemistry. This is an outline of the required steps to undertake one of these methods.
Discuss whether or not you are able to identify the solvent from the ink.
|Ink||Spot colour||Distance travelled by spot (mm)|
Explain why the distances travelled by each spot were measured in mm, rather than in cm.
Measurements in millimetres are more precise than those in centimetres. They will give more precise Rf values.
It is important in this practical activity to use appropriate apparatus and methods. This includes the safe use and careful handling of substances. Eye protection must be worn.
Evaluate the hazards and the precautions needed to reduce the risk of harm. For example:
|Hot apparatus||Skin burns||Allow apparatus to cool before touching it|
|Bunsen burner flame||Skin burns||Keep hair and clothes tucked in|
|Bunsen burner flame||Fire||Do not bring flammable solvents near to the flame|
|Harmful solvent||Skin irritation||Avoid skin contact, eg wear gloves|
|Harmful solvent||Breathing difficulties||Ensure adequate ventilation or use a fume cupboard|