Ionic Compounds and Insoluble Salts

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1. What colours do calcium and copper metals create during a flame test?

  • calcium = red and copper = blue/green
  • calcium = blue/green and copper = red
  • calcium = purple and copper = red
  • calcium = orange and copper = pruple
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2. What is the test for chlorides?

  • dd chlorine and water and if it begans to smoke and fizz it was a chloride
  • Add citric acid and lead chloride solution and if it changes colour from clear to red it was a chloride
  • Add dilute nitric acid and silver nitrate solution and if a white precipitate of silver chloride forms, the original was a chloride.
  • Add dilute hydrochloric acid and barium chloride to the solution. If a white precipitate of barium chloride forms, the original was a chloride

3. Name all of the insoluble substances (including exceptions)

  • Silver and lead chlorides, lead, barium and calcium sulfates and carbonates and hydroxides
  • sodium, potassium and ammonium carbonates and hydroxides
  • chlorides, sulfates, nitrates and salts of sodium, potassium and ammonium
  • nitrates, sulfates and salts

4. What is the test for sulfates?

  • Add chlorine and water and if it begans to smoke and fizz it was a sulfate.
  • Add citric acid and lead chloride solution and if it changes colour from clear to red it was a sulfate.
  • Add dilute hydrochloric acid and barium chloride to the solution. If a white precipitate of barium sulfate forms, the original was a sulfate.
  • Add dilute nitric acid followed by silver nitrate solution and if a white precipitate emerges, it was a sulfate originally.

5. Name all of the soluble substances (excluding exceptions)

  • lead, barium and calcium sulfates
  • silver and lead chlorides
  • chlorides, sulfates, nitrates and salts of sodium, potassium and ammonium
  • carbonates and hydroxides

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