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IGCSE Chemistry > Identification Of Ions > Flashcards

Identification Of Ions Flashcards

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1
Q

What are flames tests used for

A

Metal ions

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2
Q

What are we testing for when using aqueous sodium hydroxide or aqueous ammonia

A

Cations.

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3
Q

branch of chemistry that uses tests to identify gases and ions

A

Qualitative analysis

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4
Q

Ammonia
Test

A

Turns damp red litmus paper blue

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5
Q

Carbon dioxide (CO2)
Test

A

Turns limewater milky

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6
Q

Chlorine (Cl2)

Test

A

Bleaches snap litmus paper white

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7
Q

Hydrogen (H2)
Test

A

Makes a lighted splint go pop when held over

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8
Q

Oxygen (O2)
Test

A

Reignites a glowing splint

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9
Q

Sulfur dioxide (SO2)
Test

A

Turns acidified aqueous potassium manganate (VII) from purple to colourless

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10
Q

Identify carbonate CO3 2-

A

React with dilute acid the test for carbon dioxide gas (turns limewater milky)
Effervescence, carbon dioxide produced

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11
Q

Identify Chloride in a solution
Cl-

A

Acidify with dilute nitric acid and add aqueous silver nitrate
White ppt.

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12
Q

Identify Bromide in a solution
Br-

A

Acidify with dilute nitric acid then add aqueous silver nitrate
Cream ppt.

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13
Q

Identify iodide in a solution
I-

A

Acidify with dilute nitric acid, add aqueous silver nitrate
Yellow ppt.

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14
Q

Identify nitrate in a solution
NO3 -

A

Add aqueous sodium hydroxide then aluminium foil and warm carefully
Ammonia produced (turns damp red litmus paper blue)

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15
Q

Identify sulphate in a solution
SO4 2-

A

Acidify with dilute nitric acid then add aqueous barium nitrate
White ppt.

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16
Q

Identify sulfite in a solution

A

Add a small volume of acidified aqueous potassium manganate (VII)
The acidified aqueous potassium manganate (VII) turns from purple to colourless

17
Q

Identify aluminium

A

In aqueous sodium hydroxide: white ppt. Soluble in excess giving a colorless solution
In aqueous ammonia: white ppt. Insoluble in excess

18
Q

Identify ammonium
NH4+

A

In aqueous sodium hydroxide: ammonia produced on warming
In aqueous ammonia: nothing

19
Q

Identify calcium
Ca 2+

A

In aqueous sodium hydroxide: white ppt. Insoluble in excess
In aqueous ammonia: no ppt. Or very slight white ppt.

20
Q

Identify chromium (III)
Cr 3+

A

In aqueous sodium hydroxide: green ppt. soluble in excess
In aqueous ammonia: grey-green ppt. Insoluble in excess

21
Q

Identify copper
Cu 2+

A

In aqueous sodium hydroxide: light blue ppt. Insoluble in excess
In aqueous ammonia: light blue ppt. Soluble in excess giving a dark blue solution

22
Q

Identify iron (II)
Fe 2+

A

In aqueous sodium hydroxide: green ppt. Insoluble in excess, turns brown near surface on standing
In aqueous ammonia: green ppt. Insoluble in excess, turns brown near surface on standing

23
Q

Identify iron (III)
Fe 3+

A

In aqueous sodium hydroxide: red-brown ppt. Insoluble in excess
In aqueous ammonia: red-brown ppt. Insoluble in excess

24
Q

Identify zinc
Zn 2+

A

In aqueous sodium hydroxide: white ppt. Soluble in excess giving a colourless solution
In aqueous ammonia: white ppt. Soluble in excess Giving a colourless solution

25
Q

Tests for aqueous cations

A

Aqueous sodium hydroxide
Aqueous ammonia

26
Q

Flame test lithium
Li+

A

Red flame

27
Q

Flame test sodium
Na+

A

Yellow flame

28
Q

Flame test potassium
K+

A

Lilac flame

29
Q

Flame test calcium

A

Orange-red flame

30
Q

Flame test barium

A

Light green flame

31
Q

Flame test copper

A

Blue-green flame

IGCSE Chemistry (21 decks)

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