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Test For Ions

Test for positive and negative ions C3

QuestionAnswer
Lithium ions Li + Flame test- Crimson
Sodium ions Na + Flame test- Yellow
Potassium ions K + Flame test- Lilac
Calcium ions Ca 2+ Flame test- Red Add sodium hydroxide to make a white precipitate and then you have calcium hydroxide solution
Barium ions Ba 2+ Flame test- Green
Aluminium ions Al 3+ Add sodium hydroxide to make a white precipitate and then add again to re-dissolve the aluminium hydroxide solution
Magnesium ions Mg 2+ Add sodium hydroxide to make a white precipitate and then you have magnesium hydroxide solution
Copper(11) ions Cu 3+ Add sodium hydroxide to make a blue precipitate and then you have copper(11) hydroxide solution
Iron(11) ions Fe 3+ Add sodium hydroxide to make a green precipitate and then you have iron(11) hydroxide solution
Iron(111) ions Fe 3+ Add sodium hydroxide to make a brown precipitate and then you have iron(111) hydroxide solution
Carbonate ions Add dilute hydrochloric acid to the substance and see if it fizzes. If it does and the gas produced turns limewater milky, the substance contains carbonate ions
Chloride ions Cl - Add dilute nitric acid and then silver nitrate solution to form white precipitate
Bromine ions Br - Add dilute nitric acid and then silver nitrate solution to form cream precipitate
Iodide ions I - Add dilute nitric acid and then silver nitrate solution to form yellow precipitate
Sulfate ions Add dilute hydrochloric acid and then barium chloride solution. if a white precipitate forms, sulphate ions are present
Created by: bitesize21