Question

Na salt of which acid is used for preparation of ethane. Write chemical equation for the reaction

Answer 1

Sodium salt of butanoic acid used to make ethane.

Answer 2

Na salt of propionic acid (CH₃CH₂COONa) is used for the preparation of ethane.

We are required to find the chemical equation for the preparation of ethane from the sodium salt.

We know the chemical formula of ethane is CH₃-CH₃ (C₂H₆).

• When the sodium propionate undergoes decarboxylation in the presence of calcium oxide gives ethane and Sodium carbonate as by-product.
• The above reaction is known as the decarboxylation reaction.

The Chemical reaction is

CH₃CH₂COONa    +   NaOH ⇒ C₂H₆ + Na₂CO₃

where,

CH₃CH₂COONa - sodium propionate (sodium salt of propionic acid)

NaOH - sodium hydroxide

C₂H₆ - Ethane (main product)

Na₂CO₃ - Sodium carbonate (by-product)

Therefore, Na salt of propionic acid (CH₃CH₂COONa) is used for the preparation of ethane.

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