Cations Flashcards

1
Q

Groups:

A
  1. dil HCl
  2. H2S in dil HCl
    a. InSoluble in yellow ammonium sulphide
    b. Soluble in Yellow Ammonium Sulphide
  3. NH4OH in NH4Cl
  4. H2S in NH3 and NH4Cl
  5. (NH4)2CO3 in NH4Cl and NH4OH
  6. No common
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2
Q
  1. dil HCl
A

Pb2+ (PbCl2 -> Soluble in Hot water)
Hg+
Ag+

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3
Q

2a. H2S in dil HCl
Insoluble in yellow ammonium sulphide

A

Hg2+
Cu2+
Cd2+
Bi3+
Pb2+

Ppt in both acidic and basic medium
lower ksp

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4
Q

2b. H2S in dil HCl
Soluble in Yellow Ammonium Sulphide

A

As3+
As5+

Sb3+
Sb5+

Sn2+
Sn4+

ppt in both acidic/basic medium

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5
Q
  1. NH4OH in NH4Cl
A

Fe3+
Al3+
Cr3+

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6
Q
  1. H2S in NH3 and NH4Cl
A

Ni2+
Co2+
Mn2+
Zn2+

Only Basic Medium Ppt

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7
Q
  1. (NH4)2CO3 in NH4Cl and NH4OH
A

Ba2+
Sr2+
Ca2+

White Precipitate. Insoluble in water

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8
Q
  1. No common group re-agent
A

Mg2+
Na+
K+
NH4+ –> Na2HPO4

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9
Q
  1. NH4+
A

Liberates ammonia with NaOH, KOH

Not Mg(OH)2 -> Insoluble in water

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10
Q
  1. i) Pb2+ tests (Acid and Bases)
A
  1. White ppt with dil. HCl -> Soluble in hot water and conc HCl
  2. Insoluble Ph(OH2) with NH4OH
  3. Soluble Pb(OH)2 with NaOH
    -> Oxidised to PbO2 with H2O2 and Na2S2O8
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11
Q
  1. i) Pb2+ Tests (Other re-agents)
A
  1. K2CrO4
  2. KI
  3. KCN
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12
Q
A
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