28: Technicolor Fun

Here are two problems which will keep you busy for a week or two! They involve thought, planning and research, with colourful results.

A. Technicolor Tubes
What you do

Eye ProtectionWarning
Produce as many different coloured bands in one boiling tube as you can! You must have your proposal checked by your chemistry teacher before you start. You should investigate miscibility, comparative densities, methods of minimising mixing while adding liquids and suitable colouring agents for each layer. Once you have developed your prototype you can scale it up for display in a large measuring cylinder.
Eye Protection
eye protection must be worn

Warning
ask your teacher to make sure that your plans are safe

B. Creating Colour
What you will need

universal indicator
distilled water
dilute hydrochloric acid
sodium hydroxide solution		eye protection

What you do

Eye ProtectionIrritant
Produce test tubes half-full of each of five different coloured solutions e.g. red, yellow, green, blue, violet. When you have completed this write down a reliable recipe that someone else could use for creating a test tube half-full of yellow solution.
Eye Protection
eye protection must be worn

Irritant
IRRITANT
sodium hydroxide

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