The chemical traffic light is the reaction of the color change in the solution that is also related to the blue bottle experiment. One of the earliest formulas consists of glucose, sodium hydroxide, indigo carmine, and water. Other formulas consist of indigo carmine, dye, ascorbic acid (Vitamin C), sodium bicarbonate, sodium chloride, copper (II) sulfate, sodium hydroxide and water. Thus, chemical waste and corrosive chemicals levels are reduced. The amount of solid chemicals dissolved in the experiment can be reduced from 60 grams to 6 grams. And the pH can be lowered from 13 to 3 which is easier to neutralize the pH to 7 by adding baking soda before disposal. Also, it's safer and the reaction also happens faster and easier to do.
Initially, all the chemicals are added together and the color looks yellow. After shaking, the color turns green and then turns red after being touched. When observed further, the color turns yellow again, which is why the solution is called a chemical traffic light. This reaction can be repeated many times, but requires additional oxygen or indigo carmine.
Video Chemical traffic light experiment
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This experiment is about the oxidation and reduction of solutions in which the alkaline glucose solution acts as a reducing agent. Glucose solution is added to the solution containing the indigo (coloring indigo carmine) color change occurs. This reaction is also known as a chemical clock experiment because the product concentration and reactants change over a period of time. When the solution is shaken, oxygen dissolves in solution and oxidizes indigo carmine. The solution becomes red if a small amount of dissolved oxygen, and green if all indigo carmine is oxidized. The solution will return to the original yellow color when the concentration of oxygen levels drops.
Materials
- 1% methylene blue or 1% indigo carmine indicator solution, 100 mL
- dextrose, 6g
- Deionized water
- NaOH (Sodium Hydroxide), 0.5 M, 500 mL
- 1-L soda bottle, clean
Alternate method
Preparing bottles in advanced can be done as well, by making all the solutions at room temperature. Usually, it takes about 2 minutes to have a full yellow color. However, after making the solution between 15-45 minutes, the color will change quite much faster. After 45 minutes the color will be less impressive, which may be a good practical way to add more dye.
Maps Chemical traffic light experiment
Disposal
All fluids from the experiment can be safely poured into the sink and drift with plenty of water.
See also
- The blue bottle experiment
- Eliminate valentine experiment
References
External links
- Outside the blue bottle on Youtube
Source of the article : Wikipedia
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