Detection & Identification

Detecting negatively and positively charged ions. Ammonium ions and flame tests are covered.

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What is the test for chloride ions?

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Dissolve in dilute nitric acid. A white precipitate will form with a silver nitrate solution

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What is the test for bromide ions?

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Dissolve in dilute nitric acid then a cream precipitate forms with silver nitrate solution

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What is the test for iodine?

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Dissolve in dilute nitric acid. A pale yellow precipitate will form with silver nitrate solution

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What is the test for sulphate?

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Dissolve in dilute hydrochloric acid. A white precipitate of barium sulphate will form with a barium chloride solution

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What is the test for nitrate?

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Add sodium hydroxide solution and aluminium poder. Warm and ammonia will be given off with will term damp, red litmus paper blue.

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What is the test for carbonate?

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Add dilute acid. Carbon dioxide gas will be released and this can be tested with the use of limewater, which will turn cloudy.

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What is the test for copper?

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Add sodium hyroxide  solution and a pale blue precipitate will form

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What is the test for iron II?

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Add sodium hydroxide solution and a dirty green precipitate will form. If left it will turn a rusty brown

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What is the test for iron III?

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Add sodium hyrdoxide solution and a rusty brown precipitate will form

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What is the test for aluminium?

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Add sodium hyrdroxide solution and a white precipitate will form. This will dissolve in excess sodium hydroxide

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What is the test for magnesium?

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Add sodium hydroxide solution and a white precipitate will form

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What is the test for calcium?

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Add sodium hydroxide solution and a white precipitate will form

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What colour flame does sodium produce?

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Bright yellow

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What colour flame does lithium produce?

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Scarlet red

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What colour flame does calcium produce?

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Brick red

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What colour flame does potassium produce?

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Lilac

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What colour flame does barium produce?

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Apple green

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