Ionic Compounds and Insoluble Salts

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1. 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
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2. Name all of the soluble substances (excluding exceptions)

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

3. What is spectroscopy and why is it used?

  • It is when a gaenocologists takes a look at the nether regions of a woman's parts and tries to work out what elements may be stuck in there.
  • It is a test where the patterns of light emitted by the elements in a heated sample are analysed. It is fast and reliable and can be used to detect very small amounts of element in a sample.
  • This is the correct term for a flame test and they are used to find out what element/elements a substance contains.
  • It is when a sample of an element is placed under an ultra magnifying lense and tiny tiny amounts of the element can be seen. It is very accurate.

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

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

5. Name the exceptions to being insoluble

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


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