Test tubes were given with a) ethyl alcohol; b) ethylene glycol solution; c) acetic acid solution;

| February 13, 2021 | education

Test tubes were given with a) ethyl alcohol; b) ethylene glycol solution; c) acetic acid solution; d) sodium acetate solution. Chemically determine each of these substances.

1. Test tube with ethyl alcohol.
Iodoform test. Formation of a yellow iodoform precipitate.
C2H5OH + 6 NaOH + 4 I2 = CHI3 + HCOONa + 5 NaI + H2O

2. Test tube with ethylene glycol.
Qualitative reaction to polyhydric alcohols. Blue coloration of the solution due to the formation of copper glycolate.
OH-CH2-CH2-OH + Cu (OH) 2 = CH2-O-Cu-O-CH2 + H2O

3. A test tube with acetic acid.
Reaction with amyl alcohol in the presence of sulfuric acid. Characteristic smell of pear essence (amyl acetate).
CH3COOH + C5H11OH = CH3 (CH2) 4OCOCH3 + H2O

4. Test tube with sodium acetate.
Reaction with ferric iron. The solution becomes red-brown in color.
3CH3COONa +3 HOH + FeCl3 = 3CH3COOH + Fe (OH) 3 + 3NaCl



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