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Chemistry > Qualitattive Analysis > Flashcards

Qualitattive Analysis Flashcards

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1
Q

Ca2+
1)Color after drop dropwise addition of sodium hydroxide solution

2)Effect of adding excess sodium hydroxide solution on the precipate

A

White

Precipate is insoluble in excess, therefore it remains

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2
Q

Al3+
1)Color after drop dropwise addition of sodium hydroxide solution

2)Effect of adding excess sodium hydroxide solution on the precipate

A

White
Precipate is soluble in excess, it dissolves and forms a colourless solution

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3
Q

Zn2+
1)Color after drop dropwise addition of sodium hydroxide solution

2)Effect of adding excess sodium hydroxide solution on the precipate

A

White
Precipate is soluble in excess, dissolves and turns colourless

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4
Q

Pb2+
1)Color after drop dropwise addition of sodium hydroxide solution

2)Effect of adding excess sodium hydroxide solution on the precipate

A

White
Precipate is soluble in excess, dissolves and forms a colourless

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5
Q

Fe2+
1)Color after drop dropwise addition of sodium hydroxide solution

2)Effect of adding excess sodium hydroxide solution on the precipate

A

Green,turns brown on standing
Precipate is insoluble in excess, therefore it remains

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6
Q

Fe3+
1)Color after drop dropwise addition of sodium hydroxide solution

2)Effect of adding excess sodium hydroxide solution on the precipate

A

Red-Brown
Precipate is insoluble in excess, therefore it remains

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7
Q

Cu2+
1)Color after drop dropwise addition of sodium hydroxide solution

2)Effect of adding excess sodium hydroxide solution on the precipate

A

Blue
Precipate is insoluble in excess, therefore it remains

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8
Q

NH4+
1)Color after drop dropwise addition of sodium hydroxide solution

2)Effect of adding excess sodium hydroxide solution on the precipate

A

No prepitate

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9
Q

Ca2+
1)Color after drop dropwise addition of aqueous ammonia solution

2)Effect of adding excessammonia solution solution on the precipate

A

No precipate

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10
Q

Al3+
1)Color after drop dropwise addition of ammonia solutionsolution

2)Effect of adding excessammonia solutionsolution on the precipate

A

White precipitate forms (Al(OH)3).

Aluminium hydroxide is insoluble in excess NH4OH(aq), therefore it remains

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11
Q

Pb2+
1)Color after drop dropwise addition of ammonia solutionsolution

2)Effect of adding excess ammonia solution solution on the precipate

A

White precipitate forms (Pb(OH)2).

Lead(II) hydroxide is insoluble in excess NH4OH(aq) therefore it remains

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12
Q

Zn2+
1)Color after drop dropwise addition of ammonia solutionsolution

2)Effect of adding excess ammonia solution e solution on the precipate

A

White
Zinc hydroxide (Zn(OH)2) is soluble in excess
dissolves and turns colourless

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13
Q

Cu2+
1)Color after drop dropwise addition of ammonia solutionsolution

2)Effect of adding excess ammonia solution solution on the precipate

A

Blue

Copper(II) hydroxide (Cu(OH)2) is soluble in excess NH4OH(aq).

Precipitate dissolves, forming a deep blue solution.

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14
Q

F2+
1)Color after drop dropwise addition of ammonia solutionsolution

2)Effect of adding excess ammonia solution solution on the precipate

A

Green precipitate forms (Fe(OH)2).

Iron(II) hydroxide is insoluble in excess NH4OH(aq), therefore it remians

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15
Q

Fe3+
1)Color after drop dropwise addition of ammonia solutionsolution

2)Effect of adding excess ammonia solution solution on the precipate

A

Red-brown precipitate forms (Fe(OH)3).

Iron(III) hydroxide is insoluble in excess NH4OH(aq),therefore it remains.

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16
Q

Identify
Hydrogen

A

A colourless gas
Has no smell
Place a lit splint in the gas. A squeky pop is heard and the splint is extinguished

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17
Q

Identify
Oxygen

A

A colourless gas
Has no smell

place a glowing splint in the gas.The glowing splint glows brighter

18
Q

Identify
Carbon Dioxide

A

A colourless gas
Has no smell

Bubble the gas into lime water,white precipitate forms

19
Q

Ammonia

A

A colourless gas
Has a pungent Odour

Turns moistred litmus paper blue

20
Q

Hydrogen Chloride

A

A colourless gas
Has a sharp acid smell

Forms white fumes when
brought neara drop of concentrated ammonia
solution on aglass rod.

21
Q

Sulfur Dioxide

A

A colourles gas
has a choking smell

Turns acidified
potassium
manganate(VII)
solution from
purple to
colourless.

Turns acidified
potassium
dichromate(VI)
solution from
orange to green.

22
Q

Chlrine

A

A yellow - green gas
Has a sharp odur us poisonous

Turn moist blue litmus paper to ren then bleahes it white

23
Q

Nitrogen Dioxide

A

A brown gas
Has a sharp irritaing odour is toxic

Turns moist blue litmus paper to red

24
Q

water Vapour

A

A colourless gas
Has no smell

turns dry cobalt chlride paper from blue to pink

Turns anhydrous copper sulfate from white to blue

25
Q

Effect of Heat on
C032-

A

Carbon Dioxide is evolved whihc forms a white precipitate in lime water

26
Q

effect of Heat on
NO3-

A

Oxygen is evolved which relights a glowing splint

27
Q

Effect of Heat on NO3-

A

Brown gas(Nitrogen gas) is evolved and Oxygen is evolved which relights a glowing splint

28
Q

Adding Dilute acid
CO32-

A

Efferevence occurs.Carbon Dioxide is evolved which forms a white precipitae in lime water

29
Q

Adding Dilue acid
SO32-

A

Effevence ocurs,Sulfer dioxide evolved on heating which turs acodfoed potassium manganate solution from purple to colourless

30
Q

Reacting with Concentrated Sulfuric acid
CO3^2-

A

Observation: A white precipitate forms in lime water.
Gas Test: Produces carbon dioxide.

31
Q

Reacting with Concentrated Sulfuric acid
SO3^2

A

Observation: Acidified potassium manganate(VII) solution changes from purple to colorless.
Gas Test: Produces sulfur dioxide.

32
Q

Reacting with Concentrated Sulfuric acid
Cl-

A

Observation: White fumes form with ammonia gas.
Gas Test: Produces hydrogen chloride.

33
Q

Reacting with Concentrated Sulfuric acid
Br-

A

Observation: A red-brown gas is seen.
Gas Test: Produces bromine.

34
Q

Reacting with Concentrated Sulfuric acid
I-

A

Observation: A grey-black solid forms which sublimes to form purple vapor if heated.
Gas Test: Produces iodine.

35
Q

Reaction with silver nitrate solution followed by aqueous ammonia:
Cl-

A

Precipitate: White precipitate (AgCl) which dissolves forming a colorless solution in aqueous ammonia.

36
Q

Reaction with silver nitrate solution followed by aqueous ammonia:
Br-

A

Precipitate: Cream precipitate (AgBr) which slightly dissolves forming in aqueous ammonia. solution

37
Q

Reaction with silver nitrate solution followed by aqueous ammonia:
I-

A

Precipitate: Pale yellow precipitate (AgI) which remains insoluble in aqueous ammonia.

38
Q

Reaction with barium nitrate solution followed by dilute acid:
SO4^2-

A

Precipitate: White precipitate (BaSO4) which remains insoluble and does not react with dilute acid.

39
Q

Reaction with barium nitrate solution followed by dilute acid:
CO3^2-

A

Precipitate: White precipitate (BaCO3) which dissolves in dilute acid, releasing carbon dioxide.

40
Q

Reaction with barium nitrate solution followed by dilute acid:
SO3^2-

A

Precipitate: White precipitate (BaSO3) which dissolves in dilute acid, releasing sulfur dioxide upon heating.

Chemistry (9 decks)

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