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Chemistry O Level > Identification of ions & gases > Flashcards

Identification of ions & gases Flashcards

1
Q

Zn2+ with NaOH

A

white precipitate
- dissolves in excess to give a clear colourless solution

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2
Q

Zn2+ with NH3

A

white precipitate
- dissolves in excess to give a clear colourless solution

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3
Q

Al3+ with NaOH

A

white precipitate
- dissolves in excess to give a clear colourless solution

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4
Q

Al3+ with NH3

A

white precipitate formed
- insoluble in excess

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5
Q

Ca2+ with NaOH

A

white precipitate formed
- insoluble in excess

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6
Q

Ca2+ with NH3

A

no apparent change

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7
Q

NH4+ with NaOH

A

no apparent change
- NH3 gas evolved on warming

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8
Q

Cr3+ with NaOH

A

green precipitate
- soluble in excess to give green solution

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9
Q

Cr3+ with NH3

A

green precipitate
- insoluble in excess

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10
Q

Cu2+ with NaOH

A

light blue precipitate
- insoluble in excess

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11
Q

Cu2+ in NH3

A

light blue precipitate
- dissolves in excess to give a deep blue solution

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12
Q

Fe2+ with NaOH

A

green precipitate
- insoluble in excess

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13
Q

Fe2+ with NH3

A

green precipitate
- insoluble in excess

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14
Q

Fe3+ with NaOH

A

reddish brown precipitate
- insoluble in excess

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15
Q

Fe3+ with NH3

A

reddish brown precipitate
- insoluble in excess

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16
Q

Carbonate

A

add dilute HCl
- effervescence occurs & colourless gas is evolved turning limewater milky
-> gas is CO2

17
Q

Nitrate

A

add NaOH followed by a pinch of Al powder, warm carefully
- pungent gas evolved turning damp red litmus paper blue
-> gas is NH3

18
Q

Sulfate

A

add dilute HNO3 followed by Ba(NO3)2(aq)
- no change on addition of HNO3
- white precipitate of BaSO4 formed

19
Q

Cl-
I-
Br-

A

add dilute HNO3 followed by AgNO3
- white precipitate of AgCl
- cream precipitate of AgBr
- yellow precipitate of AgI

20
Q

I-

A

add dilute HNO3 followed by Pb(NO3)2(aq)
- yellow precipitate of PbI is formed

21
Q

Sulfite

A

add small volume of dilute HCl
- colourless gas with irritating smell is evolved
- decolourises acidified KMnO4 from purple -> colourless

22
Q

Flame test for cations

A
  • Li+ : red
  • Na+ : yellow
  • K+ : lilac
  • Ca2+ : orange-red
  • Ba2+ : apple green / light green
  • Cu2+ : bluish green
23
Q

H2 test

A
  • apply lighted splint
  • burns with a pop sound
24
Q

O2 test

A
  • apply glowing splint
  • relights glowing splint
25
Q

CO2 test

A
  • pass through limewater
  • turns limewater milky
26
Q

NH3

A
  • apply damp red litmus paper
  • litmus paper turns blue
27
Q

Cl2

A
  • apply damp blue litmus paper
  • litmus paper turns red
28
Q

SO2

A
  • pass through acidified K2CR2O7
  • acidified K2CR2O7 changes from orange -> green
29
Q

Ethene test

A
  • pass through aqueous bromine
  • decolourises aqueous bromine from reddish brown -> colourless

Chemistry O Level (16 decks)

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