Warm the solution in a Bunsen flame and test any gas given off using red litmus paper.Add a few drops of sodium hydroxide solution and a little aluminium powder.Add a few drops of barium chloride solution and then a few drops of hydrochloric acid.The precipitate is insoluble in ammonia solution.A yellow precipitate forms which does not discolour on standing.The precipitate is slightly soluble in ammonia solution.A cream precipitate forms, which discolours a little on standing.Let the mixture stand for a few minutes and then add some ammonia solution.The precipitate is soluble in ammonia solution.A white precipitate forms which discolours on standing.
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