2: Chemical Magic

What you do

1. 
   Fill the carafe with dilute sodium hydroxide solution. This is the ‘water’.
2. 
   Add a few drops of phenolphthalein indicator to one of the wine glasses.
3. Pour some of the contents of the carafe into the wine glass. Swirl the solution around to develop a pink colour. This is your ‘red wine’.
4. Pour a little dilute sulphuric acid into the second wine glass.
5. Pour the pink solution from the first wine glass into the second wine glass. The colour should disappear. Your ‘red wine’ has changed back into ‘water’ (or ‘white wine’).
6. Add barium chloride solution to the milk bottle.
7. Pour the solution from the second wine glass into the milk bottle. It should form a white cloudy suspension looking like milk.
8. Wash the carafe and milk bottle thoroughly after use.

Do not drink any of the solutions

1. 
   Dissolve 5g of iron(III) aluminium sulphate in 500cm³ of water. Pour this solution into the jug.
2. 
   Take 6 glasses and add about 50cm³ of water to each. Dissolve a small spatula measure of one of the following solids in each glass:
   Glass A: potassium thiocyanate
   Glass B: barium chloride
   Glass C: potassium hexacyanoferrate(II)
   Glass D: tannic acid
   Glass E: tartaric acid
   Glass F: sodium hydrogensulphite
   
3. Pour a few cm³ of the solution from the jug into each glass and watch what happens!