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Module 1 > Groups of Cations > Flashcards

Groups of Cations Flashcards

1
Q

Cation that does not react with HCl, forms a PRECIPITATE in H2S in dilute mineral acid medium, and forms a YELLOW precipitate with Ammonium Polysulfide.

A

Cd2+

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1
Q

Cation that does not react with HCl, H2S in dilute mineral acid medium and (NH4)2Sbut forms a **WHITE **precipitate with NH4Cl.

Fresh Sample + Saturated CaSO4 yields a **WHITE **precipitate immediately

A

Ba2+

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2
Q

Cation that does not react with HCl, forms a PRECIPITATE in H2S in dilute mineral acid medium, SOLUBLE in Ammonium Polysulfide and a fresh sample forms a YELLOW precipitate with Acidified H2​S which does not dissolve in excess (NH4)2CO3.

A

Sn4+

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2
Q

Cation that does not react with HCl and H2S in dilute mineral acid medium but forms a WHITE precipitate with (NH4)2S.

Fresh sample + NH3 forms a WHITE precipitate insoluble in excess reagent

A

Al3+

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3
Q

Cation that does not react with HCl, forms a PRECIPITATE in H2S in dilute mineral acid medium, SOLUBLE in Ammonium Polysulfide and a fresh sample forms a **BROWN **precipitate with Acidified H2S

A

Sn2+

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3
Q

Cation that does not react with HCl, forms a **PRECIPITATE **in H2S in dilute mineral acid medium, SOLUBLE in Ammonium Polysulfide and a fresh sample forms a YELLOW precipitate with Acidified H2​S which dissolves in excess (NH4)2CO3.

Fresh sample + 1:1 HCl + KI yields no coloration.

A

As3+

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5
Q

Cation that does not react with HCl, forms a PRECIPITATE in H2S in dilute mineral acid medium, INSOLUBLE in Ammonium Polysulfide and a fresh sample forms a **BLUE **precipitate with NaOH.

A

Cu2+

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6
Q

Cation which forms a precipitate with dilute HCl. Upon addition of NH3no change will be observed

A

Lead

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7
Q

Cation that does not react with HCl, H2S in dilute mineral acid medium and (NH4)2S but forms a WHITE precipitate with NH4Cl.

Fresh Sample + Saturated CaSO4 yields a **WHITE **precipitate slowly

A

Sr2+

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8
Q

Cation which forms a precipitate with dilute HCl and turns **BLACK **upon the addition of NH3

A

Hg22+

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8
Q

Cation that does not react with HCl and H2S in dilute mineral acid medium but forms a** BLACK** precipitate with (NH4)2S which is INSOLUBLE in 1:1 HCl

Fresh sample + NaOH yields a BLUE precipitate which turns PINK upon standing

A

Co2+

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9
Q

Cation that does not react with HCl and H2S in dilute mineral acid medium but forms a BLACK precipitate with (NH4)2S which is INSOLUBLE in 1:1 HCl

Fresh sample + NaOH yields a GREEN precipitate.

A

Ni2+

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10
Q

Cation that does not react with HCl and H2S in dilute mineral acid medium but forms a **GREEN **precipitate with (NH4)2S.

Fresh sample + NaOH forms a **GREEN **precipitate soluble in excess reagent

A

Cr3+

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11
Q

Cation that does not react with HCl and H2S in dilute mineral acid medium but forms a PINK precipitate with (NH4)2S.

Fresh sample + NaOH forms a WHITE precipitate that turns **DARK **upon standing.

A

Mn2+

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13
Q

Cation that does not react with HCl, forms a **PRECIPITATE **in H2S in dilute mineral acid medium, SOLUBLE in Ammonium Polysulfide and a fresh sample forms an ORANGE precipitate with Acidified H2​S. Fresh sample + 1:1 HCl + KI yields Brown Color

A

Sb5+

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14
Q

Cation that does not react with HCl, H2S in dilute mineral acid medium, (NH4)2S and NH4Cl.

Forms a **YELLOW **precipitate with COBALT URANYL ACETATE

A

Na+

15
Q

Cation which forms a precipitate with dilute HCl and dissolves upon the addition of NH3

A

Ag+

17
Q

Cation that does not react with HCl, forms a PRECIPITATE in H2S in dilute mineral acid medium, **SOLUBLE **in Ammonium Polysulfide and a fresh sample forms a YELLOW precipitate with Acidified H2​S which **DISSOLVES **in excess (NH4)2CO3.

Fresh sample + 1:1 HCl + KI yields **BROWN **coloration.

A

As4+

19
Q

Cation that does not react with HCl, forms a PRECIPITATE in H2S in dilute mineral acid medium, SOLUBLE in Ammonium Polysulfide and a fresh sample forms an ORANGE precipitate with Acidified H2​S. Fresh sample + 1:1 HCl + KI yields no color.

A

Sb3+

20
Q

Cation that does not react with HCl and H2S in dilute mineral acid medium but forms a BLACK precipitate with (NH4)2S which is soluble in 1:1 HCl

Fresh sample + NaOH yields a **GREEN **precipitate which turns **DARK **upon standing

A

Fe2+

21
Q

Cation that does not react with HCl, forms a **PRECIPITATE **in H2S in dilute mineral acid medium, INSOLUBLE in Ammonium Polysulfide and a fresh sample forms a YELLOW precipitate with NaOH.

A

Hg2+

22
Q

Cation that does not react with HCl and H2S in dilute mineral acid medium but forms a **BLACK **precipitate with (NH4)2S which is soluble in 1:1 HCl

Fresh sample + NaOH yields a REDDISH BROWN

A

Fe3+

23
Q

Cation that does not react with HCl, H2S in dilute mineral acid medium, (NH4)2S and NH4Cl.

Forms a** WHITE **precipitate with SODIUM BITARTRATE

A

K+

24
Q

Cation that does not react with HCl, H2S in dilute mineral acid medium and (NH4)2Sbut forms a WHITE precipitate with NH4Cl.

Fresh Sample + Saturated CaSO4 yields no precipitate

A

Ca2+

25
Q

Cation that does not react with HCl, H2S in dilute mineral acid medium, (NH4)2S and NH4Cl.

Vapors turn red litmus to blue when heated with NaOH

A

NH3

26
Q

Cation that does not react with HCl and H2S in dilute mineral acid medium but forms a **WHITE **precipitate with (NH4)2S.

Fresh sample + NH3 forms a WHITE precipitate soluble in excess reagent

A

Zn2+

27
Q

Cation that does not react with HCl, forms a PRECIPITATE in H2S in dilute mineral acid medium, INSOLUBLE in Ammonium Polysulfide and a fresh sample forms a WHITE precipitate with NaOH.

A

Bi3+

28
Q

Cation that does not react with HCl, H2S in dilute mineral acid medium, (NH4)2S and NH4Cl.

Forms a WHITE precipitate with excess NaOH which turns RED upon the addition of TITAN YELLOW reagent.

A

Mg2+

Module 1 (15 decks)

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