you need
  • - circle;
  • - Thermometer;
  • - plate;
  • - copper wire;
  • - tincture of iodine;
  • - potassium permanganate;
  • - baking soda;
  • - potatoes.
Take the metal cup and fill it with a third test liquid.Put on the stove and turn on the burner.Lower in alcohol thermometer.Lock boiling fluid, it can be assumed chemical composition of alcohol.Methyl alcohol boils at 64oS, ethyl - at 78 ° C.
red-hot flame of a lighter piece of copper wire and dip it in alcohol.Copper oxide formed on heating reacts with the test liquid.Among other products of the interaction will be present aldehyde, having a characteristic odor.If the test liquid - ethanol, you smell of vinegar or rotten apples.In the c
ase of methanol, formalin you breathe vapors, unpleasant irritating the nasal mucosa.
Pour a small amount of alcohol in a transparent container, add a pinch of baking soda and mix thoroughly.Drip into the mixture tincture of iodine.Look, if the precipitate fall.Ethanol in the reaction with iodine forms iodoform - insoluble yellow solid. Methanol is transparent and does not precipitate.
Add the alcohol a few crystals of potassium permanganate and heat porozovevshy solution.Effervescence indicates that before you methyl alcohol.
5 Try People's way of determining the chemical composition of alcohol.Throw in a liquid peeled potatoes for a few hours.Pink tinge indicates that methyl alcohol, blue - ethyl.