identifying ions

• aim - describe how to use chemical tests to identify ions in unknown compounds
• lilac flame means compounds contains a potassium ion
• the silver nitrate test - produce a yellow precipitate meaning compound contain iodine ion
• the flame test producing a lilac flame and silver nitrate test creating a yellow precipitate tells us that the compound is potassium iodine
• an unknown compound produced a orange - red flame and and effervesced when tested with hydrochloric acid. the gas produced turned limewater cloudy. this means it is calcium carbonate
• a compound was reacted with sodium hydroxide solution and produced a blue precipitate (contains copper II ion), then it was reacted with barium chloride solution and dilute hydrochloric acid, producing a white precipitate (sulfate ion) this means compound is copper (II sulfate)