Salt Analysis
Ammonium hydroxide is added group-wise in qualitative analysis to:
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About This Question
- Subject
- chemistry
- Chapter
- principles related to practical chemistry
- Topic
- salt analysis
- Difficulty
- Easy
- Year
- 2025
Solution
Correct Answer:
Precipitate Group III cations
In Qualitative Inorganic Analysis, cations are separated into groups based on their solubility products (Ksp).
- Group III Cations (Fe3+,Al3+,Cr3+) have relatively low solubility products for their hydroxides.
- Group Reagent: NH4OH in the presence of NH4Cl.
- Function of NH4Cl: It suppresses the ionization of NH4OH (Common Ion Effect), ensuring that the concentration of OH− ions is just enough to precipitate Group III hydroxides but not high enough to precipitate Group IV or later cations (like Mg2+).
This easy difficulty chemistry question is from the chapter principles related to practical chemistry, covering the topic of salt analysis. It appeared in the 2025 exam.
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