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Chem GCSE > Qualitative Analysis > Flashcards

Qualitative Analysis Flashcards

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1
Q

What charge ions do flame tests test for?

A

Positive ions

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2
Q

Why can you use flame tests to identify the metal ion of a compound?

A

Metals burn with a characteristic colour and therefore goes a distinctive colour over a flame

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3
Q

Describe the lab method of a flame test.

A

Clean the nichrome wire with hydrochloric acid and hold in a blue flame.
Dip wire into solid sample
Hold over a blue flame
Determine colour and identify ions.

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4
Q

Colour of Li+ ions

A

Crimson

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5
Q

Colour of Na+ ions

A

Yellow

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6
Q

Colour of K+ ions

A

Lilac

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7
Q

Colour of Cu2+ ions

A

Blue/green

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8
Q

The colour of Ca2+ ions

A

Orange/red

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9
Q

What colour precipitate is formed when copper compounds react with NaOH

A

Blue precipitate

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10
Q

What colour precipitate is formed when Iron(II) compounds react with NaOH

A

A green precipitate

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11
Q

What colour precipitate is formed when iron(III) compounds react with NaOH

A

Brown precipitate

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12
Q

What colour precipitate is formed when magnesium compounds react with NaOh

A

White precipitate

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13
Q

What colour precipitate is formed when aluminium compounds react with NaOH

A

White precipitate that’s soluble in excess

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14
Q

What colour precipitate is formed when calcium compounds react with NaOH

A

White precipitate

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15
Q

How to test for carbonate ions

A

Add 3cm3 or dilute HCl to carbonate solid salt
Test gas with limewater -> cloudy if CO2

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16
Q

How to test for alkenes

A

Bromine water orange to colourless

17
Q

Test for chlorine

A

Bleaches damp litmus paper white

18
Q

Test for hydrogen

A

Burns with a squeaky pop

19
Q

Test for oxygen

A

Relights a glowing splint

20
Q

What compound do you use to detect halide ions?

A

Silver nitrate

21
Q

Method for determining halide ions

A

Acidify salt with few drops of nitric acid then add drops of silver nitrate

22
Q

What colour would a chloride precipitate turn with silver nitrate?

A

White precipitate (WC-bleach toilet, white chlorine)

23
Q

What colour would bromide precipitate turn with silver nitrate?

A

Cream precipitate ( BC )

24
Q

What colour would a iodide precipitate turn with silver nitrate?

A

yellow precipitate

25
Q

How do you identify sulphate ions SO4^2-

A

Acidly with a few drops HCl then add barium chloride = white precipitate

26
Q

How do you determine anions?

A

Using precipitation reaction

27
Q

What colour do sulphate ion precipitate go with barium chloride?

A

White precipitate

28
Q

What is Flame emission spectroscopy?

A

Measure of wavelength of light in a flame to identify all of the ions in that mixture

29
Q

In flame emission spectroscopy how do you find concentration of ions?

A

Measure the light intensity of the flame with that wavelength for the ion

30
Q

Advantages of flame spectroscopy machine

A

Very quick and accurate, can find more data as it is density e

31
Q

DisAdvantages of flame spectroscopy machine

A

Expensive, need training to understand, complex data findings

Chem GCSE (14 decks)

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