On heating blue coloured powder of copper (II) nitrate in a boiling tube, copper oxide (black) oxygen gas and a brown gas X is formed.(a) Write a balanced chemical equation of the reaction(b) Identify the brown gas X evolved(c) Identify the type of reaction(d) What could be the pH range of the aqueous solution of the gas X
Question
On heating blue coloured powder of copper (II) nitrate in a boiling tube, copper oxide (black) oxygen gas and a brown gas X is formed.(a) Write a balanced chemical equation of the reaction(b) Identify the brown gas X evolved(c) Identify the type of reaction(d) What could be the pH range of the aqueous solution of the gas X
Solution
(a) The balanced chemical equation for the reaction is:
2Cu(NO3)2 (s) → 2CuO (s) + 4NO2 (g) + O2 (g)
(b) The brown gas X evolved is Nitrogen Dioxide (NO2).
(c) The type of reaction is Thermal Decomposition. This is because a single compound (copper (II) nitrate) breaks down into multiple products (copper oxide, nitrogen dioxide, and oxygen gas) when heat is applied.
(d) The pH range of the aqueous solution of the gas X (Nitrogen Dioxide) would be acidic. This is because when Nitrogen Dioxide is dissolved in water, it forms nitric acid. Therefore, the pH would be less than 7.
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