Tests for Positive Ions (Cations) PDF
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This document details experiments for identifying positive ions (cations), such as Fe3+ and Ca2+. The procedures involve specific chemical reactions and observations. It's a laboratory exercise in chemistry.
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Tests for Positive Ions (Cations) A. Test for Fe3+ 1. Principle. Ferric ions react with ammonium hydroxide solution to form a red-brown precipitate of ferric hydroxide: This precipitate can be confirmed by adding 3 drops of 6M HCl and mixing, notice the dissolving of red brown ppt. 2. Procedure. 1...
Tests for Positive Ions (Cations) A. Test for Fe3+ 1. Principle. Ferric ions react with ammonium hydroxide solution to form a red-brown precipitate of ferric hydroxide: This precipitate can be confirmed by adding 3 drops of 6M HCl and mixing, notice the dissolving of red brown ppt. 2. Procedure. 1. Add 1 ml of 0.1 M solution of FeCl3 in a clean dry tube. 2. Add 0.5 ml of ammonium hydroxide, observe the formation of red-brown precipitate. 3. Add 0.5 ml of 6M HCl and shake, notice the disappearance of the red precipitate. B. Test for Ca2+ 1. Principle. If a calcium containing solution is reacted with ammonium oxalate solution in an alkaline medium, a white precipitate of calcium oxalate is produced. 2. Procedure. 1. Add 1 ml drops of 0.1 M solution of Ca(NO3)2 in a clean dry tube. 2. Add 0.5 ml of 6M ammonia and shake gently. 3. Add 0.5 ml of (NH4)2C2O4 and observe the formation of white precipitate of calcium oxalate.
