Channel: DIY bama

Category: Science & Technology

Tags: methylene blueglucoseindigo carmineblue bottlesodium hydroxidebottletraffic light

Description: Introduction： Blue bottle is a funny and simple experiment. The liquid inside the bottle is initially colourless, after we shake the bottle, it will turn to blue colour magically. However, when the bottle keep stationary for a some time, it will turn to colourless again. The process can be repeatable several times Traffic light bottle is similar to blue bottle. The liquid inside the bottle is initially yellow in colour, when we shake the bottle lightly , it will turn to red colour, when we shake the bottle again, it will further turn to green colour. However, when the bottle keep stationary for a some time, it will turn to red and then to yellow . The process can be repeatable several times Procedure： Prepare a 250ml bottle ，then add some water, sodium hydroxide and glucose according to following table, make sure all the chemicals are dissolved. Then few drops of indicators can be added. Do not add too much Methylene blue for blue bottle experiment, otherwise, it take long time to turn to colourless again. A: Blue Bottle: water100ml sodium hydroxide 2g glucose 2g Methylene blue 3 drop B:Traffic Light Bottle: water100ml sodium hydroxide 1g glucose 2g Indigo carmine 15 drops 1. Sodium hydroxide is strong alkaline and very corrosive, it also called as lye. it is normally used for drain cleaning liquid. 2. Methylene blue is commonly found in aquarium. it can be used in fungal infections treatment tropical fish. It is also a common redox indicator, its oxidised state is in blue colour while the reduced state is in colourless. 3.Indigo carmine is another redox indicator, its oxidised state is in green colour while the reduced state is in yellow colour. Principle： When the bottle is being shake, methylene blue is oxidised to blue colour. when the bottle keep stationary for some time, methylene blue is reduced to colourless by glucose.