Tests for cations (AQA GCSE Chemistry): Flashcards

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Tests for cations
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Cations

Positive ions

Two methods to identify metal ions

Flame tests and reactions with sodium hydroxide

Why metals produce unique flame colors

Metal ions excited by heat emit specific light colors

Flame color of calcium

Orange-red

Flame color of sodium

Bright yellow

Flame color of potassium

Lilac (purple)

Flame color of lithium

Red

Flame color of copper

Green

Cu2+Cu^{2+} precipitate color with NaOH

Blue

Fe2+Fe^{2+} precipitate color with NaOH

Green

Fe3+Fe^{3+} precipitate color with NaOH

Brown

Metal ions forming white precipitates with NaOH

Mg, Ca, Al

Al hydroxide in excess NaOH

Dissolves

Mg & Ca hydroxides in excess NaOH

Do not dissolve

Why clean flame test wire between tests

To avoid contamination

Explore AQA GCSE Chemistry Revision Notes by Topics

Purity, Formulations & Chromatography

Identification of Common Gases

Methods of Identifying Ions

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Purity, Formulations & Chromatography

Identification of Common Gases

Methods of Identifying Ions

Explore AQA GCSE Chemistry Quizzes by Topics

Purity, Formulations & Chromatography

Identification of Common Gases

Methods of Identifying Ions

Explore AQA GCSE Chemistry Exam Questions by Topics

Purity, Formulations & Chromatography

Identification of Common Gases

Methods of Identifying Ions

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