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Cations and Anion

GCSE AQA Unit 3

QuestionAnswer
Flame test for lithium ion Crimson-red
Flame test for sodium ion Yellow-orange
Flame test for potassium ion Lilac
Flame test for calcium ion Brick-red
Flame test for barium ion Green
Sodium hydroxide precipitate test for calcium White
Sodium hydroxide precipitate test for copper Blue
Sodium hydroxide precipitate test for iron(II) Sludgy green
Sodium hydroxide precipitate test for iron(III) Reddish brown
Sodium hydroxide precipitate test for aluminium White then redissolves to form a colourless solution
Sodium hydroxide precipitate test for magnesium White
Ammonium compound and sodiuum hydroxide Red litmus paper turns blue in the presence of ammonia
Testing for carbonates Add an acid and carbon dioxide is present which can be tested by bubbling the gas through limewater which should turn cloudy
Copper carbonate changes colour from what to what when it decomposes? From green to black
Zinc carbonate changes colour from what to what when it decomposes? From white to yellow, but when it cools down it turns back to white
Test for sulfates Dilute hydrochloric acid folowed by barium chloride A white precipitate of barium sulfate should form if sulfate present
Test for halides Dilute nitric acid followed by silver nitrate solution Chloride gives white precipitate Bromide gives cream precipitate Iodide gives yellow precipitate
Test for nitrates Aluminium powder and a few drops of sodium hydroxide If nitrate present, it will be reduced to ammonia Ammonia turns red litmus paper blue
Acid + Metal carbonate gives what? Salt + Water + Carbon dioxide
Acid + Alkali gives what? Salt + Water
Acid + Metal oxide gives what? Salt + Water
Acid + Metal hydroxide gives what? Salt + Water
Created by: Marge-Homer
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