QQuestion
Rita was given an unknown salt for identification. She prepared a solution of the salt and divided it into two parts.
- To the first part of the salt solution, she added a few drops of ammonium hydroxide and obtained a reddish-brown precipitate.
- To the second part of the salt solution, she added a few drops of silver nitrate solution and obtained a white precipitate.
Name:
(a) the cation present and
(b) the anion present in the salt given for identification.
✓Answer
(a) The cation present is Ferric (Fe3+).
Reason — A reddish-brown precipitate with ammonium hydroxide indicates the presence of Ferric ions. When ammonium hydroxide is added to a solution containing Fe3+ ions, a reddish-brown precipitate of Ferric hydroxide forms.
(b) The anion present is Chloride (Cl–).
Reason — A white precipitate with silver nitrate suggests the presence of Chloride ions (Cl–). Silver nitrate reacts with chloride ions to form a white precipitate of silver chloride (AgCl).
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