Suppose you have two cans, one with ethanol, and the other - methanol.How to distinguish relatively harmless ethyl alcohol of deadly methyl?At home, the easiest and most affordable way to be the next method.Pour a small amount of alcohol and some cans in a separate glass container: glass or jar.To avoid confusion, what kind of canister sample was taken, make a mark (eg, a marker).
Then take the copper wire, better thick.One end, wrapping it around a pencil or nail fold helix.Another
clamp pliers or potholders, heat in the flame.Once the copper spiral is glowing, as quickly as possible dip it in a glass or jar with the sample.Immediately you will hear a hissing sound, and you will feel a strong foreign odor.
If the sample was methanol - the smell is very sharp, unpleasant.The fact that there was a chemical reaction: SN3OH NCHO = + H2.As a result of this reaction, compounds formed HCHO - formaldehyde (aka - formic aldehyde) with a sharp characteristic odor.
If the sample contains ethanol, the smell will be much softer, more pleasant.It resembles the aroma of fallen apples.Because there was a reaction C2H5OH = CH3CHO + H2 and the resulting acetaldehyde (or acetaldehyde).
There is also a sensitive qualitative reaction on ethyl alcohol .It's called yodoformnaya sample occurs on such a scheme: C2H5OH + 6NaON + 4I2 = CHI3 + HCOONa + 5NaI + H2O.The interaction of ethanol with an alkaline solution and iodine solution while cooling the reaction container formed light yellow slurry.With yodoformnoy samples can detect ethanol even at very low concentrations (approximately 0.05%).If the alcohol concentration and high slurry was formed fairly quickly precipitates.
- yodoformnaya sample