Question

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

• A. Decrease concentration of $OH$${}^{-}$ ion
• B. Prevent interference by phosphate ions
• C. Increase concentration of $Cl$${}^{-}$ ions
• D. Increase concentration of $NH$${}_4^{+}$ ions

Answer 1

The correct option is A Decrease concentration of $OH$${}^{-}$ ion