1.5-2 g of copper sulfate on a porcelain plate with copper wire and heat until
the blue color of the salt disappears and the release of water vapor stops.
Cool the white powder and place in a dry test tube, add 2-3 ml of ethyl
alcohol. With shaking, stirring and heating, the white powder in the vial
quickly turns blue.
dehydrated alcohol is separated and used for the next work.
Formation and Hydrolysis of Alcohol.
freshly cut, purified, dried metallic sodium from kerosene in dehydrated ethyl
alcohol (dehydrated) like a pea. Dip the mixture into a test tube in a glass of
cold water so that it does not heat up and the alcohol does not boil. When the
gas begins to spread evenly, put a flame of fire in the mouth of the test tube.
Evolved hydrogen: combines with air with a characteristic sound, ignites.
The liquid gradually
thickens, becomes covered with a layer of solid alcohol and slows down the
reaction. Heat slowly to keep the reaction going. If hydrogen evolution stops,
Na is completely insoluble. Undissolved potassium granules are removed with a
flexible wire and placed in a jar with the remaining sodium. The resulting
concentrated alcoholic solution crystallizes upon cooling. Add 5-6 ml of water
to the test tube and check the phenolphthalein solution.
Oxidation of ethyl alcohol in a mixture of chromium.
Procedure: Add 2
ml of potassium dichromate solution, 1 ml of dilute sulfuric acid and 0.5 ml of
ethyl alcohol to the test tube and heat slowly, the solution will lose color
and turn green. The reaction proceeds quickly and produces a characteristic
acetaldehyde odor. Chromium is oxidized to 6 valencies.
Oxidation of ethyl alcohol with potassium permanganate.
Procedure: 0.5 g
in a test tube with a conductive tube. Add KMnO4, 3 ml water and 0.5
ml ethyl alcohol. On the melting side, the reaction is fast. Therefore, cool
the tube in a glass of water. The mixture is heated for 1-2 minutes to a boil,
then 3 ml of dilute sulfuric acid is added, a boiling stone is added, the tube is
connected and about 0.5 ml of liquid is injected into the receiving tube.
Determines the smell of distillation and the influence of litmus on the
reaction. The qualitative reaction is carried out with acetic acid (with FeCl3
Extraction of Iodoform from Alcohol.
methyl alcohol, ethyl alcohol, their close analogues, ethylene glycol.
3-4 drops of alcohol and 2-3 ml of water in a test tube. The resulting solution
is carefully heated, 0.5–1 ml of iodine solution is added, and alkali solution
is added dropwise until the color of the solution disappears. Iodoform
precipitates have a light yellow color and a characteristic Iodoform odor.
the reaction of sodium ethylate formation.
that adding water after hydrogen evolution stopped the removal of the white
the reaction equations for the production of acetaldehyde from ethylene.
Laboratory work. Topic: Study of the properties of monohydric alcohols
Determines the smell of distillation and the influence of litmus on the reaction