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JAMB Chemistry 1984 Question 19

Question 19

Nitrogen and its Compounds

Which of the following methods may be used to prepare trioxonitrate (V) acid (nitric acid) in the laboratory?

  1. A.Heating ammonia gas with tetraoxosulphate (VI) acid.
  2. B.Heating ammonium trioxonitrate (V) with tetraoxosulphate (VI) acid
  3. C.Heating sodium trioxonitrate (V) with tetraoxosulphate (VI) acid
  4. D.Heating potassium trioxonitrate (V) with calcium hydroxide.
  5. E.Heating a mixture of ammonia gas and oxygen.
Show the answer and explanation

Answer: C (Heating sodium trioxonitrate (V) with tetraoxosulphate (VI) acid)

Explanation

In the laboratory, a trioxonitrate (V) salt such as NaNO3 or KNO3 is heated with concentrated H2SO4; the more volatile nitric acid distils off.