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Chapter 4 inorganic chem
Tests for ions
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How can you detect carbonate ions and hydrogen carbonate ions?
in dilute HCl both will
fizz
and give off
CO2
you can
bubble
the CO2 in
limewater
and if it goes
cloudy
CO2 is present.
If it goes
cloudy
the
carbonate
or
hydrogen
carbonate ions have been identified
How do you test for sulfates?
Add dilute
HCl
and follow it with
barium chloride
solution. If a
white
precipitate forms, the
original
compound contained sulfate.
What can you use to test for ammonium compounds?
ammonia gas is an
alkaline
, so you can test for it using
damp
red litmus paper.
If it goes
blue
ammonia is present.
For substances containing ammonium ions:
Add some
sodium
hydroxide to the substance and gently
heat
it
If
ammonia
is given off, ammonium ions are
present