- - 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.
methods described above will not be valid in the case in methanol ethanol will contain impurities, and vice versa.
Domestic methods for determining the chemical composition of alcohol are not absolutely correct.The exact result is possible only after the chromatographic analysis in a chemistry lab.