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When excess of NH(3) (aq) is added to a ...

When excess of `NH_(3)` (aq) is added to a blue solution containing `Cu_((aq))^(2+)` ions

A

Solution turns red due to formation of `Cu^(+)` ions

B

Solution becomes red due to formation of `[Cu (NH_(3))_(4)]_(aq)^(2+)`

C

Solution become deep blue due to formation of `[Cu(NH_(3))_(4)]_(aq)^(2+)`

D

Solution becomes colourless due to excess colourless `NH_(3)`

Text Solution

AI Generated Solution

The correct Answer is:
**Step-by-Step Text Solution:** 1. **Identify the Initial Solution:** - The blue solution contains `Cu^(2+)` ions, which indicates the presence of copper(II) ions in aqueous form. 2. **Add Excess Ammonia (NH3):** - When excess ammonia (`NH3`) is added to the solution containing `Cu^(2+)`, a chemical reaction occurs. 3. **Formation of a Complex:** - The `Cu^(2+)` ions react with the ammonia to form a complex ion. The specific complex formed is `Cu(NH3)4^(2+)`. 4. **Determine the Geometry of the Complex:** - The complex `Cu(NH3)4^(2+)` has a tetrahedral geometry. 5. **Color of the Complex:** - The color of the resulting complex `Cu(NH3)4^(2+)` is deep blue. 6. **Conclusion:** - Therefore, the observation when excess `NH3` is added to the blue solution of `Cu^(2+)` ions is that the solution remains deep blue due to the formation of the complex `Cu(NH3)4^(2+)`. **Final Answer:** - The solution becomes deep blue due to the formation of `Cu(NH3)4^(2+)` complex. ---
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