Wet Test Analysis for Acid Radicals: Preparation of solution for acid radical examination | Chemistry by Burhan Ishaque

Take 1 gm of the given mixture and about 2 grams of pure solid Na₂CO₃ in a china dish. Add 15-20 cm³ of distilled water. Boil for 5 minutes and filter. Reject the residue, if any. Treat the filtrate with ammonia. This may be called as neutral solution or N.S.

Pass H₂S gas through a test portion. If yellow or orange ppt. is obtained, then pass H₂S through whole solution until substance is completely precipitated. Filter, reject the ppt. and boil of H₂S from filtrate. Make this filtrate slightly alkaline by the addition of ammonia. Call this filtrate as original solution or O.S. and use it for the examination of acid radials.

Preparation of aqueous solution:

Take 1 gram of mixture and 10 cm³ of distilled water in a china dish. Boil for 5 minutes and filter. Reject the residue. Call this filtrate as aqueous solution (Aq. Soln.)