Salt X is sodium ethanoate and the evolved gas is carbon dioxide.
The reaction is given below:
CH3COOH + NaHCO3 → CH3COONa + H2CO3
(a) Take a test tube and a bent tube.
(b) Take ethanoic acid and sodium bicarbonate solution in the test tube.
(c) Insert the bent tube in the cork and fit the cork at the mouth of the test tube.
(d) Fill lime water in the bent tube so that lime water is in the ‘U’ portion of this tube.
After some time; it is observed that the lime water turns milky. This confirms that the evolved gas is carbon dioxide. The diagram is given below:
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