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Nessler's reagent is...

Nessler's reagent is

A

`K_(2)HgI_(4)`

B

`K_(2)HgI_(4)+KOH`

C

`K_(2)HgI_(2)+KOH`

D

`K_(2)HgI_(4)+Ki`

Text Solution

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The correct Answer is:
**Step-by-Step Text Solution:** 1. **Definition of Nessler's Reagent**: Nessler's reagent is a chemical solution used primarily for the detection of ammonia in various samples. 2. **Chemical Composition**: The primary component of Nessler's reagent is potassium tetraiodomercurate(II), which is represented by the chemical formula K2HgI4. 3. **Alkaline Solution**: Nessler's reagent is prepared as an alkaline solution. This means that it is mixed with a base, typically potassium hydroxide (KOH), to create the necessary alkaline environment. 4. **Preparation**: To prepare Nessler's reagent, K2HgI4 is dissolved in a solution containing KOH. The alkaline conditions are essential for the reagent to function effectively in detecting ammonia. 5. **Final Composition**: Therefore, the final composition of Nessler's reagent can be summarized as K2HgI4 in an alkaline solution, specifically K2HgI4 mixed with KOH. 6. **Conclusion**: In summary, Nessler's reagent is an alkaline solution of potassium tetraiodomercurate(II), K2HgI4, combined with a base like KOH. ---
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