Ionic Compounds and Insoluble Salts

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

  • calcium = orange and copper = pruple
  • calcium = red and copper = blue/green
  • calcium = purple and copper = red
  • calcium = blue/green and copper = red
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2. Name the exceptions to being insoluble

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

3. What colours do potassium and sodium metals create during a flame test?

  • potassium = purple and sodium = yellow/orange
  • potassium = yellow and sodium = blue
  • potassium = blue and sodium = red
  • potassium = green and sodium = purple

4. What is the test for chlorides?

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

5. What is the test for carbonates?

  • Add hydrochloric acid and barium chloride solution to the carbonate.
  • Use a lighted splint to create a squeaky pop in a test tube if the hydrogen is present
  • Bubble a gas through lime water and if carbon dioxide is present it will turn milky.
  • Use a smouldering splint and see if it relights in the test tube if oxygen is present


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