GCSE Chemistry (AQA)

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Flame Tests

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Chemical analysis Identification of ions by chemical and spectroscopic means

Flame Tests

2:46 Tests for Ions
Spec 4.8.3.1
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  • Bionic compounds can be tested to identify the ions they contain.
  • Example: Lithium oxide (LI���O) consists of two lithium metal ions and one oxide ion.
  • Lithium ions have a specific electronic structure and are considered metal ions or cations.
  • Metal ions in compounds can be identified using a flame test.
  • Flame tests are conducted using a solid sample and a metal wire, which must be inert and have a high melting point.
  • Microme wires are often used for flame tests.
  • The compound on the wire changes the color of the flame, indicating the cation present.
  • It's important to clean the wire between tests to avoid mixed colors.
  • Flame test colors for specific ions:
  • Lithium: Crimson flame
  • Sodium: Yellow flame
  • Potassium: Lilac flame
  • Calcium: Orange-red flame
  • Copper (Cu�����): Green flame

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