C3 - Analysing Substances - Anion tests

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1. How would you test for a halide ion?

  • react with silver nitrate (and dilute nitric acid)
  • flame test
  • react with barium chloride (and HCL)
  • react with Sodium Hydroxide
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2. How would you test for sulphate ions?

  • Add sodium hydroxide
  • react with dilute acid
  • Add Barium chloride (in presence of dilute HCL)
  • Flame test

3. What would be the result of a sulphate test?

  • Carbon dioxide would be produced (turns limewater cloudy)
  • Yellow Iodine sulphate would form
  • White Barium sulphate precipitate would form
  • Cream Chlorine sulphate would form

4. What is the charge of Anions?

  • Negative
  • Positive
  • No charge

5. How would you test a substance to see if it contains a carbonate ion?

  • Add silver nitrate solution (and dilute nitric acid)
  • React with dilute acid
  • Add sodium hydroxide
  • Flame test

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