Youtor
CG493 Dulce Oración PistaLetrasKaraoke
>> YOUR LINK HERE: ___ http://youtube.com/watch?v=-DCkPN_FgOQ
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. • When the solution is shaken its color is converted into blue. Repeating of that experiment needs safety knowledge and wearing gloves. Facebook: / thoisoi2 • Patreon: https://www.patreon.com/Thoisoi?ty=h • Music: http://audiomicro.com
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