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Chemistry > Identification Tests of Ions and Gases > Flashcards

Identification Tests of Ions and Gases Flashcards

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1
Q

aq. Al +3

A

T: Add aq. NaOH OR aq. NH3 solution
O: White ppt of Al(OH)3 formed (soluble in excess NaOH, insoluble in aq. NH3)

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2
Q

aq. NH4 +

A

T: Add aq. NaOH solution
O: Ammonia evolved (detect by smelling or by using damp red litmus paper - becomes blue)

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3
Q

aq. Ca +2

A

T: Add aq. NaOH OR aq. NH3 solution
O: White ppt of Ca(OH)2 formed (insoluble in excess NaOH, soluble in aq. NH3)

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4
Q

aq. Cu +2

A

T: (1) Add aq. NaOH solution / (2) Add aq. NH3 solution
O: (1) Blue ppt of Cu(OH)2 formed, insoluble in excess reagent / (2) Pale blue ppt of Cu(OH)2 formed (soluble in excess reagent) & a dark blue solution

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5
Q

aq. Fe +2

A

T: Add aq. NaOH OR aq. NH3 solution
O: Dark green ppt of Fe(OH)2 formed (insoluble in excess reagent)

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6
Q

aq. Fe +3

A

T: Add aq. NaOH OR aq. NH3 solution
O: Rust brown ppt of Fe(OH)3 formed (insoluble in excess reagent)

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7
Q

aq. Zn +2

A

T: Add aq. NaOH OR aq. NH3 solution
O: White ppt of Zn(OH)2 formed (soluble in excess reagent)

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8
Q

aq. Cr +3

A

T: Add aq. NaOH OR aq. NH3 solution
O: Grey-green ppt of Cr(OH)3 formed (soluble in excess NaOH to give green solution, insoluble in aq. NH3)

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9
Q

aq. CO3 -2

A

T: Add dilute acid (effervescence) - bubble gas through limewater
O: CO2 gas produced turning limewater milky/cloudy due to formation of CaCO3

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10
Q

aq. Cl -

A

T: Add acidified aq. AgNO3
O: White ppt of AgCl formed, turns purple-grey in bright light

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11
Q

aq. Br -

A

T: Add acidified aq. AgNO3
O: Yellow/cream ppt of AgBr formed, soluble in excess NH3

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12
Q

aq. I -

A

T: (1) Add acidified aq. AgNO3 / (2) Add acidified aq. Pb(NO3)2
O: (1) Yellow ppt of AgI formed, insoluble in excess NH3 / (2) Yellow ppt of PbI2 formed

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13
Q

aq. NO3 -

A

T: Add aq. NaOH solution & Al metal & heat
O: Ammonia evolved (detect by using damp red litmus paper - turns blue)

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14
Q

aq. SO3 -2

A

T: Add aq. HCl solution & heat - then, the SO2 test (bubble gas through potassium permanganate solution)
O: Solution changes colour from purple to colourless

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15
Q

aq. SO4 -2

A

T: Add acidified aq. Ba +2 ions
O: White ppt of BaSO4 formed

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16
Q

NH3 gas

A

T: Damp red litmus paper
O: Turns litmus paper blue

17
Q

CO2 gas

A

T: Bubble gas through limewater
O: Turns limewater cloudy/milky due to formation of insoluble CaCO3

18
Q

Cl2 gas

A

T: Damp litmus paper
O: Bleaches litmus paper

19
Q

H2 gas

A

T: Ignite using lighted splint
O: Burns with a squeaky pop

20
Q

O2 gas

A

T: Use glowing splint
O: Ignites or glows much more brightly

21
Q

SO2 gas

A

T: Bubble gas through potassium permanganate solution
O: Solution changes colour from purple to colourless

Chemistry (1 decks)

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