Extraction of ethylene hydrocarbons

Laboratory work №4

    Topic: Extraction of ethylene hydrocarbons.

The purpose of the work: to master the extraction of ethylene by laboratory means and to study its properties, to compare with the properties of methane.

    Necessary equipment: ethyl alcohol, bromine water (liquefied light yellow), potassium permanganate (highly liquefied).

 Course of work: We take ethylene methane in a container, but between the Cork with a gas-conducting tube and the rubber tube we put a glass tube with a small piece of natron trace in the middle with a short (5-6 cm) non-dense cotton on both sides.

In a test tube, pour 1 ml of alcohol and 4 ml of concentrated sulfuric acid, gently moving. In the heated mixture put a boiling stone (kipyatil Kameshki). We continue the gas-conducting tube and carefully heat it until the initial uniform gas is released. The mixture darkens. In the future, we will carry out the work in the same way as in practice No. 3. Only the brooding and oxidation of ethylene occurs faster, and the color of the flame is brighter than that of methane.

All this phenomenon is characteristic of unsaturated hydrocarbons. When you drag a porcelain plate into the ethylene flame, black soot spots appear.

Control questions:

1.Write down the equation of the ethylene extraction reaction in the laboratory.

2. Why should sulfuric acid used in practice be concentrated?

3. Why does ethylene deform potassium permanganate solution?

4. What is the difference between an ethylene flame and a methane flame?

5.Write down the equation of the ethylene combustion reaction.