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Chemistry > Ion separation > Flashcards

Ion separation Flashcards

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1
Q

Group 1 cations

A

Ag2+, Pb2+, Hg2+

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2
Q

Group 2 cations

A

As3+, Bi3+, Cd2+, Cu2+, Hg2+, Sb3+, Sn2+

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3
Q

Group 3 cations

A

Cr3+, Mn2+, Fe2+, Fe3+, Co2+, Ni2+, Zn2+, Al3+

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4
Q

Group 4 cations

A

Mg2+, Ca2+, Sr2+, Ba2+

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5
Q

Group 5 cations

A

Li+, Na+, K+, Rb+, Cs+, NH4+

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6
Q

When HCl is added

A

Precipitates group 1 cations as insoluble chlorides.
AgCl, PbCl2, Hg2Cl2

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7
Q

When H2S is added

A

H2S is a colorless inflammable gas having a rotten egg smell.
Group 2 cations will be precipitated as acid insoluble sulfides.
As2S3, Bi2S3, CdS, CuS, HgS, Sb2S3, SnS

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8
Q

Sb

A

Antimony

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9
Q

Bi

A

Bismuth

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10
Q

Add NaOH, NH3 OR (NH4)2S

A

Group 3 cations will be precipitated as base insoluble sulfides or hydroxides.
Cr(OH)3, MnS, FeS, CoS, NiS, ZnS, Al(OH)3

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11
Q

Add Na2CO3 or (NH4)2HPO4

A

Precipitates group 4 cations as insoluble carbonates or phosphates.
MgCO3, CaCO3, SrCO3, BaCO3

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12
Q

Procedure for obtaining group1 chlorides as precipitates

A

Cold dilluted HCl is added to the solution

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13
Q

Process of obtaining group 2 sulfides as precipitates

A

The filtrate from obtaining group 1 precipitates is still acidic.
H2S is passed through the solution

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14
Q

Process of obtaining group 3 hydroxides and sulfides as precipitates

A

Add NH4Cl and NH4OH. Then pass H2S through the solution

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15
Q

Process of obtaining group 4 carbonates as precipitates

A

Boil the filtrate obtained to repel H2S. Then add little amount of NH4Cl and NH40H in excess. Heat the solution and add (NH4)2CO3 solution.

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16
Q

Black sulfides

A

Bi2S3, Pbs, CuS, HgS, CoS, NiS

17
Q

Yellow sulfides

A

CdS, As2S3, SnS2

18
Q

Sb2S3

A

Orange

19
Q

SnS

A

Brown

20
Q

MnS

A

Pink

21
Q

ZnS

A

White

22
Q

Chlorides formed by group 1 cations

A

All are white in color.

23
Q

Colour of Cr 3+ in acidic medium

A

Green

24
Q

Will Pb2+ form a precipitate upon addition of hot conc. HCl

A

It will not
Pb2+ will form complex ion chlorides with hot conc.HCl

Chemistry (15 decks)

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