Question

Explain the following:

(a) Carbonic acid gives an acid salt but hydrochloric acid does not. Explain.

(b) Dil. HCl acid is stronger than highly concentrated acetic acid. Explain.

(c) H3PO3 is not a tribasic acid.

(d) Lead carbonate does not react with dilute HCl.

(e) Nitrogen dioxide is a double acid anhydride.

Answer 1

Answer:

Explanation:

We have answered your first 2 queries.

1. Carbonic acid is a diprotic acid. After neautralisation it is still consist of one H that can be displaced. On the other hand in HCl there is no more replaceable H. Due to this carbonic acid gives an acid salt but HCl does not give the same.

2. Both hydrochloric acid as well as acetic acid is acids; however they differ in their strength. The strength of an acid is determined by the extent of its ionisation in aqueous solution. HCl ionises 100% in aqueous solution while highly concentrated acetic acid ionises upto 5%. Due to this HCl is stronger than conc. acetic acid.

Answer 2

$\huge\mathcal{\fcolorbox{lime}{black}{\blue{Question :-}}}$

Explain the following:

(a) Carbonic acid gives an acid salt but hydrochloric acid does not. Explain.

(b) Dil. HCl acid is stronger than highly concentrated acetic acid. Explain.

(c) H3PO3 is not a tribasic acid.

(d) Lead carbonate does not react with dilute HCl.

(e) Nitrogen dioxide is a double acid anhydride.

$\huge\mathcal{\fcolorbox{lime}{black}{\blue{AnsweR :-}}}$

(a) Carbonic acid is a dibasic acid with two replaceable hydrogen ions; therefore it forms one acid salt or one normal salt.

Hydrochloric acid is a monobasic acid with one replaceable hydrogen ion and so forms only one normal salt.

(b) Strength of an acid is the measure of concentration of hydronium ions it produces in its aqueous solution. Dil. HCl produces high concentration of hydronium ion compared to that of concentrated acetic acid. Thus, dil. HCl is stronger acid than highly concentrated acetic acid.

(c) H3PO3 is not a tribasic acid because in oxyacids of phosphorus, hydrogen atoms which are attached to oxygen atoms are replaceable. Hydrogen atoms directly bonded to phosphorus atoms are not replaceable.

(d) The salt produced is insoluble in the solution so the reaction does not proceed. Hence, we do not expect lead carbonate to react with hydrochloric acid.

(e) NO2 is called double acid anhydride because two acids – nitrous acid and nitric acid – are formed when it reacts with water.

2NO2 + H2O → HNO2 + HNO3

$\huge\mathcal{\fcolorbox{lime}{black}{\blue{Hope It Helps :)}}}$