Question

What happens when a small piece of sodium is dropped into ethanol?

Answer 1

The sodium piece reacts vigorously to produce bubbles of a gas. It then disappears. The reaction is: 

CH3CH2OH + Na -----> CH3CH2ONa + H2 

CH3CH2ONa is called Sodium Ethoxide. 

Answer 2

When a small piece of sodium is dropped into ethanol, it reacts strongly and produces bubbles of gas.

Explanation:

• Phenols and alcohols reacts with active metals to produce corresponding alkoxides or phenoxides and hydrogen. When a sodium is dropped into ethanol, it produces salt, sodium ethoxide, and hydrogen gas is evolved.

• The chemical reaction between ethanol and sodium metal take place is given below:

$2 \mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{OH}(\mathrm{Ethanol})+2 \mathrm{Na}(\text { Sodium }) \rightarrow 2 \mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{ONa}(\text { Sodium ethoxide })+\mathrm{H}_{2}(\text { Hydrogen })$

• On evaporation, the end product formed is the precipitate of sodium ethoxide.

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