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Chemistry🧪 > Qualitative Analysis > Flashcards

Qualitative Analysis Flashcards

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1
Q

Ammonium, NH4+
Reaction with :
Aq. NaOH & Aq. NH3/NH4OH

A

Aq. NaOH:
No Precipitate formed. Colourless & Pungent Gas Formed (Ammonia Gas )

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2
Q

Zinc, Zn2+

Reaction with :
Aq. NaOH & Aq. NH3/NH4OH

A

Aq. NaOH:
White Precipitate formed, soluble in EXCESS Aq. NaOH forming a COLOURLESS solution

Aq. NH3/NH4OH:
White Precipitate formed, soluble in EXCESS Aq. NH3 forming a COLOURLESS solution.

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3
Q

Calcium, Ca2+

Reaction with :
Aq. NaOH & Aq. NH3/NH4OH

A

Aq. NaOH:
White Precipitate formed, insoluble in EXCESS Aq. NaOH.

Aq. NH3/NH4OH:
No visible reaction

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4
Q

Lead(II), Pb2+

Reaction with :
Aq. NaOH & Aq. NH3/NH4OH

A

Aq. NaOH:
White Precipitate formed, soluble in EXCESS Aq. NaOH forming a colourless solution.

Aq. NH3/NH4OH:
White Precipitate formed, insoluble in EXCESS Aq. NH3.

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5
Q

Copper(II), Cu2+

Reaction with :
Aq. NaOH & Aq. NH3/NH4OH

A

Aq. NaOH:
Blue Precipitate formed, insoluble in EXCESS Aq. NaOH

Aq. NH3/NH4OH:
Blue Precipitate formed, soluble in EXCESS Aq. NH3 forming a DEEP BLUE solution.

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6
Q

Iron(II), Fe2+

Reaction with :
Aq. NaOH & Aq. NH3/NH4OH

A

Aq. NaOH:
Dirty-Green Precipitate formed, insoluble in EXCESS Aq. NaOH

Aq. NH3/NH4OH:
Dirty-Green Precipitate formed, insoluble in EXCESS Aq. NH3

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7
Q

Iron(III), Fe3+

Reaction with :
Aq. NaOH & Aq. NH3/NH4OH

A

Aq. NaOH:
Reddish-Brown Precipitate formed, insoluble in EXCESS Aq. NaOH

Aq. NH3/NH4OH:
Reddish-Brown Precipitate formed, insoluble in EXCESS Aq. NH3

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8
Q

Sulfate, SO42-

Test & Observation

A

Test:
Add dil. HNO followed by Aq. Ba(NO3)2

Observation:
No visible reaction upon adding dil. HNO.
White Precipitate formed when Aq. Ba(NO3)2 is added into the solution.

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9
Q

Chloride, Cl-

Test & Observation

A

Test:
Add dil. HNO followed by Aq. AgNO

Observation:
No visible reaction upon adding dil. HNO.
White Precipitate formed when Aq. AgNO is added into the solution.

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10
Q

Nitrate, NO3-

Test & Observation

A

Test:
Add Aq. NaOH into the test tube along with Aluminium Foil. Heat the test tube gently & test the gas produced with moist red litmus paper

Observation:
Effervescence observed. Colourless & pungent gas produced will turn moist red litmus paper blue

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11
Q

Carbonate, CO32-

Test & Observation

A

Test:
Add dil. HCl into the test tube & bubble the gas produced through limewater (Ca(OH)2).

Observation:
Effervescence observed. Colourless & odourless gas produced, forming white precipitate with limewater

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12
Q

Ammonia, NH3

Test & Observation

A

Test:
Place a moist red litmus paper above the mouth of the test tube to be tested.

Observation:
If the gas is Ammonia, the colourless & pungent gas will turn the moist red litmus paper blue.

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13
Q

Carbon dioxide, CO2

Test & Observation

A

Test:
Bubble gas through limewater to be tested .

Observation:
If the gas is carbon dioxide, the colourless & odourless gas will form a white precipitate with limewater.

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14
Q

Chlorine, Cl2

Test & Observation

A

Test:
Place a moist blue litmus paper above the mouth of the test tube.

Observation:
If the gas is chlorine, the colourless & pungent gas will turn the moist blue litmus paper red before decolourizing it.

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15
Q

Hydrogen, H2

Test & Observation

A

Test:
Insert a lighted splint into the test tube to be tested.

Observation:
If the gas is Hydrogen, the colourless & odourless gas will extinguish the lighted splint with a ‘pop’ sound.

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16
Q

Oxygen, O2

Test & Observation

A

Test:
Insert a glowing splint into the test tube to be tested.

Observation:
If the gas is Oxygen, the glowing splint will relight/burst into flames.

17
Q

Sulfur Dioxide, SO2

Test & Observation for both oxidising agents.

A

Test:
Place a filter paper soaked with Acidified Potassium Manganate (VII) above the mouth of the test tube to be tested.

OR

Place a filter paper soaked with Acidified Potassium Dichromate (VI) above the mouth of the test tube to be tested.

Observation:
If the gas is Sulfur Dioxide, the purple Acidified Potassium Manganate (VII) will decolourize.

OR

If the gas is Sulfur Dioxide, the orange Acidified Potassium Dichromate (VI) will turn green

Chemistry🧪 (1 decks)

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