You will need
  • - the tubes;
  • - liquid glycerin;
  • - liquid ethanol;
  • - laboratory scales;
  • - sodium hydroxide;
  • - copper sulphate;
  • - a glass funnel with paper filter.
Instruction
1
Of course, to distinguish glycerol from the ethanol, you can use widespread among the chemists way is by smell. But better for him not to have recourse, as a pair of many chemicals are poisonous. Especially do not try liquid taste. This method of comparison needs to be banned!
2
Ethanol – flowing liquid, it is less dense than water. Glycerin – a viscous liquid, denser than water. Take two measuring cups of the same weight (test tubes or small beakers with graduations), pour into them equal quantities of liquids such as 5 milliliters. Carefully tilt the tank, then put back upright. The alcohol will flow down the walls of the vessel instantly, the glycerin will drain slowly, "slow", leaving the walls of the film.
3
Alternately, weigh the plastic container on a sensitive balance (preferably a lab). The one that weighs more, contains glycerin.
4
You can also benefit in another way. To do this, start rushing to the solution of salt of copper in a solution of sodium hydroxide. Almost immediately drop out of the blue precipitate of copper hydroxide – Cu(OH)2. Transfer a little of this precipitate (preferably after its separation on a paper filter) into a transparent container with the test substance, mix vigorously. If there really containing glycerin, copper hydroxide will dissolve, and the solution will take a beautiful rich blue shade. If the tank contained ethanol, this result will not be!
5
This quality reaction based on the ability of polyols to form a dyed glycerate copper. In the same way, for example, can be distinguished from ethyl alcohol ethylene glycol.