3.3 qualitative Flashcards

1
Q

test for carbonate ions

A
  1. add dilute nitric acid
  2. if present, bubbles of carbon dioxide formed
  3. indentified by limewater turning cloudy
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2
Q

test for sulfate ions

A
  1. adding barium ions to give white ppt
  2. using barium chloride or barium nitrate
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3
Q

test for ammonium ions

A
  1. adding hydroxide ions and heating solution
  2. positive = release ammonia which will turn damp red litmus paper blue
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4
Q

sequence for tests

A
  1. carbonate ions
  2. sulfate ions
  3. halide ions
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5
Q

why should the test for sulfate ions be carried out in acidified conditions?

A

to ensure the removal of carbonate ions

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6
Q

why should the carbonate test be peformed before the sulfate test?

A

barium carbonate is a white ppt so all cabronate ions need to be removed before barium is added or it will be a false positive test

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