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JEE Main Chemistry Class 12 Analytical Chemistry Questions
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© examsnet.com
Question : 1
Total: 106
In the precipitation of the iron group (III) in qualitative analysis, ammonium chloride is added before adding ammonium hydroxide to :
[4 Apr 2024 Shift 1]
prevent interference by phosphate ions
decrease concentration of
−
OH
ions
increase concentration of
Cl
−
ions
increase concentration of
NH
4
+
ions
Validate
Solution:
NH
4
OH
⇌
NH
4
+
+
OH
−
NH
4
Cl
⟶
NH
4
+
+
Cl
Due to common ion effect of
NH
4
+
,
[
OH
−
]
decreases in such extent that only group-III cation can be precipitated, due to their very low
K
s
p
in the range of
10
−
38
.
© examsnet.com
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