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11BT Paper 2 > 8 Analysis Separate > Flashcards

8 Analysis Separate Flashcards

1
Q

What is a flame test?

A

A test to identify metal ions (cations)

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2
Q

What is the colour of the flame produced from a lithium containing compound?

A

Crimson

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3
Q

What is the colour of the flame produced from a copper containing compound?

A

Green

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4
Q

What is the colour of the flame produced from a sodium containing compound?

A

Yellow

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5
Q

What is the colour of the flame produced from a potassium containing compound?

A

lilac

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6
Q

What is the colour of the flame produced from a calcium containing compound?

A

Orange-red

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7
Q

Other than flame tests, how can metal ions be identified?

A

Use of sodium hydroxide

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8
Q

Which solutions produce white precipitates on addition of sodium hydroxide?

A

Solutions containing aluminium, magnesium, calcium ions

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9
Q

How can a solution of aluminium ions be distinguished from calcium and magnesium ones?

A

Its precipitate will dissolve in excess sodium hydroxide

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10
Q

What is the colour of the precipitate formed from the addition of sodium hydroxide to a solution containing copper (II) ions?

A

Blue

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11
Q

What is the colour of the precipitate formed from the addition of sodium hydroxide to a solution containing iron(II) ions?

A

Green

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12
Q

What is the colour of the precipitate formed from the addition of sodium hydroxide to a solution containing iron(III) ions?

A

Brown

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13
Q

What is the test for carbonates?

A

Add an acid to generate carbon dioxide gas

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14
Q

What is the test for halides?

A

Add silver nitrate and nitric acid to generate a solid silver halide precipitate

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15
Q

What are the colours of the silver halides?

A

Silver chloride white, silver bromide cream, silver iodide yellow

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16
Q

What is the test for sulfate ions?

A

Add barium chloride and hydrochloric acid, forms white precipitate

17
Q

What is an instrumental method?

A

Use of scientific technology to perform chemical analysis

18
Q

What are the three advantages of instrumental methods?

A

They are accurate (gives correct results), sensitive (only needs a small sample to work), rapid (a lot faster than other tests)

19
Q

What is flame emission spectroscopy?

A

An instrumental analysis tool for identifying metal ions

20
Q

How is flame emissions spectroscopy carried out?

A

Sample placed in a flame, light emitted is passed through a spectroscope to give a spectrum which can be compared to a reference

11BT Paper 2 (12 decks)

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