The figure given below illustrates the apparatus used in the laboratory preparation of nitric acid:

(i) Name A (a liquid), B (a solid) and C (a liquid).
(ii) Write the balanced chemical equation to show how nitric acid undergoes decomposition.
(iii) Write the balanced chemical equation for the reaction in which copper is oxidised by concentrated nitric acid.

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Solution

(i) A: Concentrated sulphuric acid; B: Nitre; C: Nitric acid
(ii) $4 {HNO}_{3} \to 2 H_{2} O + 4 {NO}_{2} + O_{2}$
(iii) $Cu + 4 {HNO}_{3} \to Cu {({NO}_{3})}_{2} + 2 H_{2} O + 2 {NO}_{2}$

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The figure given below illustrates the apparatus used in the laboratory preparation of nitric acid.

(a) Name A (a liquid), B (a solid) and C (a liquid). (Do not give the formulae).

(b) Write an equation to show how nitric acid undergoes decomposition.

Q. (a) Write a balanced chemical equation for the laboratory preparation of nitric acid.
(b) In the preparation of nitric acid from

K N O_{3}

, concentrated hydrochloric acid is not used in place of concentrated sulphuric acid. Explain why.
(c) Conc. nitric acid prepared in laboratory is yellow in colour. Why? How is this colour removed? [4 MARKS]

Q. (i) Explain, why only all glass apparatus should be used for the preparation of nitric acid by heating concentrated sulphuric acid and potassium nitrate.
(ii) Write a chemical equation to illustrate the acidic nature of nitric acid.

(a) (i) Explain, why only all glass apparatus should be used for the preparation of nitric acid by heating concentrated acid and potassium nitrate.
(ii) Write a chemical equation to illustrate the acidic nature of nitric acid.
(iii) Name the products formed when ammonium nitrate is heated.

Q. Write the balanced equation for the reaction in which copper is oxidized by concentrated nitric acid.

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(i) A: Concentrated sulphuric acid; B: Nitre; C: Nitric acid (ii) 4HNO3→2H2O+4NO2+O2 (iii) Cu+4HNO3→CuNO32+2H2O+2NO2

(i) A: Concentrated sulphuric acid; B: Nitre; C: Nitric acid
(ii) $4 {HNO}_{3} \to 2 H_{2} O + 4 {NO}_{2} + O_{2}$
(iii) $Cu + 4 {HNO}_{3} \to Cu {({NO}_{3})}_{2} + 2 H_{2} O + 2 {NO}_{2}$