If to an aqueous solution of CuSO4 in two tubes, we add ammonia soluti

1.	If to an aqueous solution of CuSO4 in two tubes, we add ammonia solution in one tube and HCl(aq) to the other tube, how the colour of the solutions will change ? Explain with the help of reaction.
Answer» In first case, colour will change from blue to deep blue. [Cu (H₂O)₄] ²⁺ + 4 NH₃ → [Cu (NH₃)₄] ²⁺ + 4H₂O [Cu (NH₃)₄] ²⁺ = deep blue While in second case, its colour will change to yellow. [Cu (H₂O)₄] ²⁺ + 4 Cl^– → [CuCl₄]^2- + 4H₂O [CuCl₄]^2- = Yellow

If to an aqueous solution of CuSO4 in two tubes, we add ammonia solution in one tube and HCl(aq) to the other tube, how the colour of the solutions will change ? Explain with the help of reaction.

Answer»

In first case, colour will change from blue to deep blue.

[Cu (H₂O)₄] ²⁺ + 4 NH₃ → [Cu (NH₃)₄] ²⁺ + 4H₂O

[Cu (NH₃)₄] ²⁺ = deep blue

While in second case, its colour will change to yellow.

[Cu (H₂O)₄] ²⁺ + 4 Cl^– → [CuCl₄]^2- + 4H₂O

[CuCl₄]^2- = Yellow