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Literally Balless! > QA Part I > Flashcards

QA Part I Flashcards

1
Q

What is the colour and odour of hydrogen gas (H2)?

A

Colourless and odourless

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2
Q

What is the result of the litmus test for hydrogen gas?

A

Nothing. No effect.

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3
Q

What confirmation test do we use for hydrogen gas?

A

Lighted splint test. Place a lighted splint a test tube containing the gas. The lighted splint will extinguish with a ‘pop’ sound.

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4
Q

What is the colour and odour of carbon dioxide?

A

Colourless and odourless

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5
Q

What is the litmus test result for carbon dioxide?

A

Turns moist blue litmus paper red.

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6
Q

What is the confirmation test for carbon dioxide gas?

A

Bubble the gas into limewater (calcium
hydroxide). A white precipitate of Calcium
Carbonate will form. Calcium carbonate will
dissolve in excess carbon dioxide gas.

If the limewater becomes chalky then carbon dioxide is present.

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7
Q

What is the colour and odour of oxygen gas?

A

Colourless and odourless.

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8
Q

What is the litmus test result for oxygen gas?

A

No effect.

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9
Q

What is the confirmation test for oxygen gas?

A

Place a glowing splint (like a joss stick) in the gas

and the glowing stick will relight.

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10
Q

What is the colour and odour of ammonia gas?

A

It is a colourless and pungent smelling gas.

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11
Q

The confirmation test for ammonia is litmus test. What is the result of the test and why do we only need to perform a litmus test?

A

Turns moist red litmus paper blue (ammonia is the only alkaline gas in this list)

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12
Q

What is the colour and odour of chlorine gas?

A

Greenish-yellow colour and irritating smell.

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13
Q

What is the litmus test result for chlorine gas (it is also the only the confirmation test).

A

Bleaching effect on litmus paper. Turn moist blue litmus paper red and then bleach the litmus paper, turning it white.

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14
Q

What is the colour and odour of sulfur dioxide gas?

A

Colourless and choking-smelling gas

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15
Q

What is the litmus test result for sulfur dioxide gas?

A

Turns moist blue litmus paper red.

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16
Q

What is the confirmation test for sulfur dioxide gas?

A

Place a piece of paper soaked with acidified
potassium manganate (VII)/ potassium
dichromate in the gas.
The acidified potassium manganate (VII) will turn
from purple to colourless. The acidified potassium dichromate will turn from orange to green.

17
Q

What is the colour and odour of water vapour?

A

Colourless and odourless.

18
Q

What is the litmus test result for water vapour?

A

Nothing you balless boy

19
Q

What is the confirmation test for water vapour?

A

Turns cobalt(II) chloride paper from blue to pink.

20
Q

Why does a white precipitate form in the limewater test for carbon dioxide?

A

Calcium hydroxide reacts with carbon dioxide to form insoluble calcium carbonate. The insoluble calcium carbonate will react with excess carbon dioxide to form soluble calcium hydrogen
carbonate/calcium bicarbonate

21
Q

How do you conduct tests for aqueous cations?

A
  1. Add a few drops of sodium hydroxide solution/aqueous ammonia and observe the colour of the precipitate.
  2. Add excess of sodium hydroxide solution/aqueous ammonia and observe if the precipitate dissolves.
22
Q

How do you test for ammonium ion with sodium hydroxide (no visible change with aq ammonia)

A

No precipitate forms. On heating, a pungent-smelling gas (Ammonia) which turns moist red litmus
paper blue is produced.

23
Q

How do you test for lead (II) ion in sodium hydroxide and aq. ammonia?

A

White ppt. of Pb(OH)2 is formed in both.

Pb(OH)2 dissolves in excess NaOH to form a colourless solution.

Pb(OH)2 is insoluble in excess aq. ammonia.

24
Q

How do you test for aluminium ion in NaOH and aq. ammonia?

A

White ppt. of Zn(OH)2 is formed in both.

Zn(OH)2 dissolves in excess NaOH to form a colourless solution.

Zn(OH)2 is insoluble in excess aq. ammonia.

25
Q

How do you test for zinc ion?

A

White precipitate of Zn(OH)2

is formed which dissolves in excess NaOH/ excess NH3 to form a colourless solution.

26
Q

How do you test for copper (II) ion?

A

Light blue precipitate of Cu(OH)2 is formed in both.

Cu(OH)2 is insoluble in excess NaOH, but dissolves in excess NH3 to form a dark blue solution.

27
Q

How do you test for Calcium ion?

A

White precipitate of Ca(OH)2 is formed which is insoluble in excess NaOH.

There is no visible changes in aq. ammonia as no precipitate is formed.

28
Q

How do you test for iron (II) ion?

A

Green precipitate of Fe(OH)2 is formed which is insoluble in excess NaOH/ excess NH3
.
The precipitate turns brown on standing (when you leave it alone forlong enough.)

29
Q

How do you test for iron (III) ion?

A

Reddish-brown precipitate of Fe(OH)3 is formed which is insoluble in excess NaOH/ excess NH3.
The precipitate turns brown on standing because it oxidises into iron (III) ions.

Literally Balless! (12 decks)

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