Chemistry testing for groups (PRACTICAL)

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Author:
master.director
ID:
143894
Filename:
Chemistry testing for groups (PRACTICAL)
Updated:
2012-03-26 08:19:46
Tags:
chemistry unit tests
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Description:
for the Practical coming up - use in conjunction with flame tests cards
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  1. How do you test for ammonium ion? What is the result?
    • NH4 +
    • Add small amount of NaOH (aq)
    • Place damp RED litmus paper into mouth of test tube.
    • Warm gently.
    • Litmus paper goes from red to blue. (means solution is alkali)
  2. How do you test for a Chloride ion? Results?
    • Cl -
    • Add dilute HNO3 solution
    • Add silver nitrate solution
    • Solution goes white (precipitate)
    • Add dilute ammonia and it AgCl will dissolve - leaving a colourless solution
  3. How do you test for Bromide ions? Results
    • Br -
    • Add dilute HNO3 solution
    • Add silver nitrate solution
    • Solution goes creamy (precipitate)
    • Add concentrated ammonia to give colourless solution
  4. How do you test for Iodide ions? Results?
    • I-
    • Add dilute HNO3
    • Add silver nitrate solution
    • Goes from colourless to YELLOW (precipitate)
    • AgI is too insoluble to react with ammonia, therefore, there will be no change even in addition of conc ammonia.
  5. How do you test for sulfate ions? Results?
    • SO4^2-
    • Add dilute HCl
    • Add Barium chloride
    • Colourless to milky white
  6. How do you test for Carbonate ions? Results?
    • CO3^2-
    • Set up delivery tube system
    • Place solid or solution into T.T 1
    • Add limewater to T.T 2
    • Add dilute HCl to T.T 1 and quickly plug and allow gas to bubble into limewater.
    • Limewater goes milky
  7. How do you test for Magnesium ions? Result? What else must you do?
    • Mg^2+
    • Add sodium hydroxide
    • Produce gelatinous white precipitate
    • Calcium will do the same, so test in flame. If flame colour present (brick-red) then, it is Calcium, but if there is no flame colour, then it is Magnisium ion.

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