What to do Pour 500ml of water into a 1 litre container. Add a heaped teaspoon (approximately 8 grams) of sodium hydroxide and dissolve by swirling. Add two level teaspoons (approximately 10 grams) of glucose and dissolve by swirling. Add 3-4 drops of methylene blue. Swirl the mixture and stop. The liquid should appear blue. Let the solution sit for a while and it should become clear. Give the flask a few quick shakes so that air dissolves in the solution. If you are using a lid check that it is on properly and take special care not to spill any liquid. The colour will change to blue. This will fade back to a colourless liquid again over a short period of time. The more shaking, the longer the blue colour will take to fade. The process can be repeated for over 20 cycles, you may have to allow more air in if you are using a container with a lid. After some hours, the solution will turn yellow and the colour changes will fail to occur.
Posted on: Wed, 03 Jul 2013 13:00:53 +0000
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