1.

In the precipitation of the iron group in qualitative analysis, amonium chloride is added before adding ammonium hydroxide to

Answer»

DECREASE concentration of `OH^(-)` ions
Prevent interference by phosphate ions
Increase concentration of `CL^(-)` ions
Increase concentration of `NH_(4)^(+)` ions

Solution :As `NH_(4)Cl` is a strong ELECTROLYTE. It suppresses the ionization of `NH_(4)OH`, so the concentration of `OH^(-)` ions in the solution is decreased, but it is sufficient to precipitate the III group basic radicals because the solubility product of III group hydroxides is lower than IV,
V and VI group hydroxides as


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