Chemistry
Name the products formed when:
(a) carbon and conc. nitric acid is heated,
(b) dilute HNO3 is added to copper.
Nitric Acid
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Answer
(a) The products formed when carbon and conc. nitric acid is heated are carbon dioxide, nitrogen dioxide and water
C + 4HNO3 ⟶ CO2 + 2H2O + 4NO2
(b) The products formed when dilute HNO3 is added to copper are copper nitrate, nitric oxide and water
3Cu + 8HNO3 ⟶ 3Cu(NO3)2 + 4H2O + 2NO
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Give reasons for the following:
In the laboratory preparation of nitric acid, the mixture of concentrated sulphuric acid and sodium nitrate should not be heated very strongly above 200°C.
(a) Nitric acid cannot be concentrated beyond 68% by the distillation of a dilute solution of HNO3. State the reason.
(b) What is passive iron? How is passivity removed?
Give two chemical equations for each of the following:
(a) Reactions of nitric acid with non-metals.
(b) Nitric acid showing as acidic character.
(c) Nitric acid acting as oxidising agent.
Write balanced equations and name the products formed when:
(a) Sodium hydrogen carbonate is added to nitric acid.
(b) Cupric oxide reacts with nitric acid
(c) Zinc reacts with dilute nitric acid
(d) Concentrated nitric acid is heated