|
Tips
Scale the volumes up if the audience is some way away.
Stand the phenolphthalein and copper sulphate flashs on white filter
paper and the lead nitrate one on black paper for maximum effect.
Go over the reactions with a suitable audience. Ask them to predict
the contents of the second flask (after explaining the sleight of
hand). Ask them to suggest ways of producing other colours.
Safety
Wear eye protection.
|
