Question

(a) Name the gas evolved when ethanol reacts with sodium.
(b) What type of compound is formed when a carboxylic acid reacts with an alcohol in the presence of conc. H2SO4?
(c) What will you observe when dilute ethanoic acid and dilute hydrochloric acid are put on universal indicator paper, one by one? What does it show?

Answer 1

Ans : a) Hydrogen gas

b) Ethyl Acetate

c) When dilute ethanoic acid is put on a universal indicator paper, it turns the paper orange, marking the pH level to be 4. ... On the other hand, when dilute hydrochloric acid is dropped on the universal indicator paper, it turns the paper red, marking its pH level to be about -1.

Answer 2

Gas Evolved is Hydrogen

Explanation:

• a.) When ethanol reacts with sodium, it leaves off hydrogen gas, and sodium ethoxide is formed in that process. Hence, hydrogen gas is evolved during this process.  

Reaction Involved is as shown:

$2C_2H_5OH + 2N$a --> $2C_2H_5ONa + H_2$

You can also use this equation to release hydrogen gas from ethanol and sodium reaction:  

$CH_3CH_2OH + 2Na$ --> $CH_3CH_2ONa + H_2$

• b.) Here, The carboxylic Acid - Acetic Acid/Ethanoic Acid - $CH_3COOH\ or\ C_2H_4O_2$

Alcohol - Ethanol - $C_2H_5OH$

The Compound Formed when Acetic Acid and Ethanol reacts in presence of $H_2SO_4$ is Ethyl Ethanoate ($CH_3COOC_2H_5$)

*Refer figure attached for reaction

• c.) When dil. $CH_3COOH$ is put on a universal indicator, the paper gets orange, shows pH 4 proofing itself a weak acid. On another hand, When dil. HCl is put on the same, paper gets red, showing pH -1 proving itself strong acid.