Shake the bottle and make it blue

Here is a quick little mix of chemicals to put in a bottle so that when you shake it , it will go blue. Put 5 g. glucose + 5 g. NaOH into 1/2 litre of tap water and add 1 mL of methylene blue. The solution should be colourless, but when you shake it, dissolved oxygen converts the hexose to glucuronic acid ( glucuronate in the basic solution, which gives a blue colour with the methylene blue- this will fade in time to just a thin blue layer on the surface that is in contact with the air.

The Old Nassau

The old Nassau experiment involves making MercuryII iodide which will precipitate as bright yellow/orange and then xs iodide will be converted to iodine by iodate and in the presence of starch give a blue/black colour. If you control the quantities carefully, you can carry a magic wand and shout " yazzooo" just as it goes yellow and then a few seconds later shout " blogwortz" just as it goes blue

The recipe:- Solution A - 4g starch in a little H2O to make a paste, + 500 mL boiling H2O + 13.7 g of sodium metabisulfite to 1 litre H2O

Solution B - 3g of mercury chloride to 1L H2O

Solution C - 15 g KIO3 to 1 L H2O

Mix 1:1 A & B then Add to 1 part C


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