Testing ions

You need to remember all of the results and tests for these ions!

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  • Created by: emilyanne
  • Created on: 22-05-11 17:53

Testing Positive Ions: FLAME TESTS

- A flame test is where the substance is put under a bunsen burner, and the colour of the flame tell us of ions present.

Lithium (Li+) : Crimson red flame

Sodium (Na+): Yellow/ Orange flame

Potassium (K+): Lilac

Calcium (Ca2+): Brick red

Barium (Ba2+): Green

- You need to remember all of these


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Testing Positive Ions: SODIUM HYDROXIDE

- When sodium hydroxide is added, these ions form a different coloured precipitate.

Aluminium: White precipitate

Calcium: White precipitate

Magnesium: White precipitate

Copper (II): Light blue precipitate

Iron (II): Green precipitate

Iron (III): Red precipitate

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Testing Negative Ions

Testing for a carbonate:

Add a WEAK ACID --> Salt, Water, Carbon Dioxide is formed

Testing for sulfates:

Add HYDROCHLORIC ACID --> White precipitate formed

Testing for nitrates:

Add SODIUM HYDROXIDE, then ALUMINIUM --> Ammonia given off

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Testing Negative Ions

Testing for halides:

Add NITRIC ACID and SILVER NITRATE:

Chloride ions: White precipitate formed

Bromide ions: Cream precipitate formed

Iodide ions: Yellow precipitate formed

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