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Chemistry > Cations, Anions, Tests for Gases, and Flame Tests for Metal Ions > Flashcards

Cations, Anions, Tests for Gases, and Flame Tests for Metal Ions Flashcards

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1
Q

Test and result for carbonate, CO3^2−

A

Test: add dilute acid then test for carbon dioxide
gas

Result: effervescence, carbon dioxide produced

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2
Q

Test and result for chloride, Cl−
[in solution]

A

Test: acidify with dilute nitric acid, then add
aqueous silver nitrate

Result: white ppt.

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3
Q

Test and result for bromide, Br −
[in solution]

A

Test: acidify with dilute nitric acid, then add
aqueous silver nitrate

Result: cream ppt.

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4
Q

Test and result for iodide, I−
[in solution]

A

Test: acidify with dilute nitric acid, then add
aqueous silver nitrate

Result: yellow ppt.

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5
Q

Test and result for nitrate, NO3–
[in solution]

A

Test: add aqueous sodium hydroxide, then
aluminium foil; warm carefully

Result: ammonia produced

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6
Q

Test and result for sulfate, SO4^2−
[in solution]

A

Test: acidify with dilute nitric acid, then add aqueous barium nitrate

Result: white ppt.

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7
Q

Test and result for sulfite, SO3^2−

A

Test: add a small volume of acidified aqueous potassium manganate(VII)

Result: the acidified aqueous potassium manganate(VII) changes colour from purple to colourless

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8
Q

aluminium, Al3+

A

effect of aqueous sodium hydroxide: white ppt., soluble in excess, giving a colourless solution

effect of aqueous ammonia: white ppt., insoluble in excess

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9
Q

ammonium, NH4+

A

effect of aqueous sodium hydroxide: ammonia produced on warming

effect of aqueous ammonia: —

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10
Q

calcium, Ca2+

A

effect of aqueous sodium hydroxide: white ppt., insoluble in excess

effect of aqueous ammonia: no ppt. or very slight white ppt.

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11
Q

chromium(III), Cr3+

A

effect of aqueous sodium hydroxide: green ppt., soluble in excess

effect of aqueous ammonia: green ppt., insoluble in excess

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12
Q

copper(II), Cu2+

A

effect of aqueous sodium hydroxide: light blue ppt., insoluble in excess

effect of aqueous ammonia: light blue ppt., soluble in excess, giving a dark blue solution

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13
Q

iron(II), Fe2+

A

effect of aqueous sodium hydroxide: green ppt., insoluble in excess, ppt. turns
brown near surface on standing

effect of aqueous ammonia: green ppt., insoluble in excess, ppt. turns brown near surface on standing

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14
Q

iron(III), Fe3+

A

effect of aqueous sodium hydroxide: red-brown ppt., insoluble in excess

effect of aqueous ammonia: red-brown ppt., insoluble in excess

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15
Q

zinc, Zn2+

A

effect of aqueous sodium hydroxide: white ppt., soluble in excess, giving a colourless solution

effect of aqueous ammonia: white ppt., soluble in excess, giving a colourless solution

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16
Q

Gas test: ammonia, NH3

A

turns damp red litmus paper blue

17
Q

Gas test: carbon dioxide,
CO2

A

turns limewater milky

18
Q

Gas test: chlorine, Cl2

A

bleaches damp litmus paper

19
Q

Gas test: hydrogen, H2

A

‘pops’ with a lighted splint

20
Q

Gas test: oxygen, O2

A

relights a glowing splint

21
Q

Gas test: sulfur dioxide, SO2

A

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

22
Q

Flame test: lithium, Li+

A

Red

23
Q

Flame test: sodium, Na+

A

Yellow

24
Q

Flame test: potassium, K+

A

Lilac

25
Q

Flame test: calcium, Ca2+

A

Orange-red

26
Q

Flame test: barium, Ba2+

A

Light green

27
Q

Flame test: copper(II), Cu2+

A

Blue-green

Chemistry (1 decks)

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