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. Identity the brown gas X evolved. c. Identify the type of reaction. d. What could be the pH range of aqueous solution of the gas X?
By BYJU'S Exam Prep
Updated on: September 25th, 2023
When Copper (II) nitrate is subjected to heat, it undergoes a transformation where a water molecule is lost, leading to the formation of anhydrous Copper (II) nitrate. Subsequent heating of this compound results in the production of a black residue composed of Copper oxide, a brown-coloured gas identified as Nitrogen dioxide, and an additional colourless gas.
Table of content
Heating of Copper Nitrate
Solution:
(a) The balanced chemical equation for the reaction can be written as follows:
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 a decomposition reaction. Copper(II) nitrate (Cu(NO3)2) decomposes upon heating to form copper(II) oxide (CuO), nitrogen dioxide (NO2), and oxygen gas (O2).
(d) Nitrogen dioxide (NO2) is a highly acidic gas. When dissolved in water, it forms nitric acid (HNO3) through the following reaction:
3NO2(g) + H2O(l) -> 2HNO3(aq) + NO(g)
Therefore, the aqueous solution of the gas X (NO2) would be acidic, and the pH range would likely be below 7.
Summary:
On heating blue coloured powder of copper (II) nitrate in a boiling tube, copper oxide (black), oxygen gas and a brown gas Nitrogen dioxide is formed.
- Write a balanced chemical equation of the reaction.
- Identity the brown gas X evolved.
- Identify the type of reaction.
- What could be the pH range of aqueous solution of the gas X?
Upon heating copper nitrate, it undergoes a process where the water molecule is expelled. With further heating, it continues to decompose, resulting in the formation of a brownish gas and a colourless gas. This decomposition reaction involves the transformation of copper (II) into copper oxide, nitrogen dioxide gas, and oxygen gas as the final products.
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