What substance can be used to distinguish between aqueous solutions of ethanol and glycerin?
| December 29, 2020 | education
The reagent used to distinguish between aqueous solutions of monohydric and polyhydric alcohols is freshly prepared copper hydroxide:
CuCl2 +2 NaOH = Cu (OH) 2 – blue precipitate.
a) If a solution of ethanol alcohol is added to a test tube with this precipitate, the precipitate will dissolve and a clear solution of copper ethanate is formed:
Cu (OH) 2 + 2C2H5OH = (C2H5O) 2Cu + H2O
b) If you add a glycerin solution to the sediment, then the sediment will also dissolve, but the solution will be blue because copper glycerate is formed.
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