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Question
The figure given below illustrates the apparatus used in the laboratory preparation of nitric acid.
- Name A (a liquid), B (a solid), and C (a liquid). (Do not give the formulae.)
- Write an equation to show how nitric acid undergoes decomposition.
- Write the equation for the reaction in which copper is oxidised by concentrated nitric acid.
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Solution
- A: Conc. sulphuric acid
B: Sodium nitrate or Potassium nitrate
C: Nitric acid - \[\ce{4HNO3 ->[Heat][Sunlight] 4NO2 + 2H2O + O2}\]
- \[\ce{Cu + 4HNO3 -> Cu(NO3)2 + 2NO2 + 2H2O}\]
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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 oxidized by concentrated nitric acid.
Explain the following:
Concentrated nitric acid appears yellow when it is left standing in a glass bottle.
