Chemical Traffic Light - Beautiful chemical Experiment!

Hello everyone. Today we will conduct an interesting colorful experiment, called the "Chemical traffic light".
To begin, we need to weigh out approximately 2 grams of glucose and dissolve it with a little amount of hot water.
Next, we add 10 ml of sodium hydroxide to the solution of glucose.
To make the solution colorful, take a flask, fill it with hot water, and pour there a small bit of a soluble indicator called indigocarmine.
The solution now becomes deep blue.
Afterwards, we pour alkaline solution of glucose into the flask and observe beautiful changes of color.
First, the solution becomes green, and then it turns red and eventually becomes yellow.
These colors are reminiscent of the traffic light colors -- red, yellow and green.
However, this is not all. This reaction can be reversed, simply by shaking the solution.
With a weak shake the solution becomes red, and with a strong one it turns green.
Then the reaction proceeds into the opposite direction - green, red and yellow.
So why the solution changes color when agitated?
It's because of the fact that our air contains 21% oxygen.
While shaking, the indicator solution is oxidized by the atmospheric oxygen.
A glucose, which is a reducing agent, changes back the color of the solution to yellow.
However, not only the indigocarmine has such properties.
There is also another existing indicator which is called Methylene Blue.
It can be used as well, but then the colors will be different.
When adding the alkaline solution of glucose, the solution becomes colorless.

[chanbbbbbbb]

Thank you so much!. You're such a Chemistry genius! I enjoy every science video you made and please keep up the good work! And about the language problem, it's very appreciated that you put the script at the description, that helped a lot! :)

[islamwasel]

are mythle orange indicator can work instead of indigo carmine
or any indicator

[vladimirkuchtanin]

how much is 10ml of NaOH?Is there 1g NaOH or 5 g in 10ml of NaOH solution?

[JovinGhoul]

Does the reaction ever loose its properties?
For example, if left for a week will it still react?
Assuming you have the container sealed so evaporation cannot release vapor

[matteovolpes]

can i use sugar?? or i must use the gluocose?

[MrsMedcat]

Amazing, thanks! Both the children and I enjoyed it :)

[racquesc]

Hi there! Do you know where I can get the Indigo Carmine dye/Stain in NYC? I've been looking online but it won't be delivered til next week and we need it this week for Science Fair. Thanks!!

[enzoroks]

quick question... lets say i make this at home... how long can i keep it and it will work each time i shake the solution?

[moizkhokhar]

chemistry video when it has that breaking bad audio

[Aperson-svhc]

Will this last forever? Will it allways change color when shaken?

[naufalyasin]

May I download this vidio, and reupload it?

I will cite this channel for permission

[racquesc]

Help! I can’t find indigo carmine in stores here, need it by tomorrow hopefully

[sainarasimha]

What is the purpose of this experiment? Like is it useful for the society ???

[phsandraart]

I accidentally added too much indigo carmine and now it turns yellow, red, ad dark red/black.. can I fix it?

[crieliocriel]

Can we use potassium permanganate instead of indigo carmine?

[sanjaymore]

For what time is The process of changing colors last

[scottb_]

I can't understand one word he says but rlly

[ariamegumi]

Can i use methalyne blue instead of indigo carmine

[anabatumbakas]

can i use a powdered sodium hydroxide?

[garretreed]

The second one didn’t work for me. No reaction at all