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Chemistry Unit 3 > C3.4 Further Analysis and Quantitative Chemistry > Flashcards

C3.4 Further Analysis and Quantitative Chemistry Flashcards

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1
Q

What colour flame does lithium give?

A

Crimson

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2
Q

What colour flame does sodium give?

A

Yellow

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3
Q

What colour flame does potassium give?

A

Lilac

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4
Q

What colour flame does calcium give?

A

Red

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5
Q

What colour flame does barium give?

A

Green

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6
Q

What is the precipitate made when sodium hydroxide solution reacts with copper ion (Cu2+) ?

A

A blue one

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7
Q

What is the precipitate made when sodium hydroxide solution reacts with iron II ion (Fe2+) ?

A

A green one

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8
Q

What is the precipitate made when sodium hydroxide solution reacts with with iron III ion (Fe3+) ?

A

A brown one

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9
Q

What is the precipitate made when sodium hydroxide solution reacts with with aluminium ion (Al3+) ?

A

A white one at first but then dissolves in excess sodium hydroxide solution.

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10
Q

What is the precipitate made when sodium hydroxide solution reacts with with magnesium ion (Mg2+) ?

A

A white one

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11
Q

What is the precipitate made when sodium hydroxide solution reacts with with calcium ion (Ca2+) ?

A

A white one

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12
Q

How do you test for a carbonate?

A
  • Add an acid, it should fizz as a reaction happens:
    acid + carbonate —–> CO2 + water + salt
  • Test for the CO2 by doing the limewater test, bubble the gas through limewater, if it turns cloudy then it is CO2.
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13
Q

How do you test for a halide ion?

A
  • Add dilute nitric acid then silver nitrate solution
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14
Q

What colour precipitate is looked for when testing for chloride ?

A

A white one

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15
Q

What colour precipitate is looked for when testing for bromide?

A

A cream one

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16
Q

How do you test for a sulfate?

A

Add dilute HCL followed by barium chloride solution

17
Q

What colour precipitate is looked for when testing for a sulfate?

A

A white one

18
Q

What is titration used for with acids and alkalis?

A

To see how much acid is needed to neutralise an alkali.

19
Q

Describe the titration process.

A
  • Put some alkali in a flask with an indicator
  • Add acid to the alkali using a burette, gradually while swirling the flask each time.
  • The indicator will change colour as soon as the acid is neutralised.
  • Measure how much acid was used and record.
  • Repeat
20
Q

What indicator is used in titration?

A

Phenolphthalein or methyl orange

21
Q

Why isn’t universal indicator used in titration?

A

The change in colour would be too gradual, we need an indicator which changes colour right away as soon as the alkali is neutralised.

Chemistry Unit 3 (6 decks)

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