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Chem Lab > Cations > Flashcards

Cations Flashcards

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1
Q

Ag/pb + dil HCL?

A

White ppt.

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2
Q

Cu/Cd reagent and product?

A

H2S in presence of dil HCL
Cu: dark ppt
Cd: yellow ppt.

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3
Q

Al/Cr/Fe

A

NH4OH and NH4Cl
Al: white
Fe: reddish brown
Cr: grey green

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4
Q

Zn?

A

NH4OH and H2S

White ppt.

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5
Q

Na/K

A 
Flame test
Na: golden yellow 
K: violet
Sodium cobalt nitrate
Na: no yellow ppt
K: yellow ppt
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6
Q

Test: dil. HCL

A 
S2O2: yellow ppt and burnt sulfer odor
SO4: -ve
Cl: -ve
Br: -ve
I: -ve
Co3: effervescence
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7
Q

Test: BaCl2?

A 
S2O2: -ve
SO4: white ppt.
Cl: -ve
Br: -ve
I: -ve
Co3: white ppt.
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8
Q

Test: AgNo3?

A 
S2O2: white
SO4: -ve
Cl: white
Br: yellowish white
I: yellow 
Co3: white
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8
Q

Test: AgNo3?

A 
S2O2: white
SO4: -ve
Cl: white
Br: yellowish white
I: yellow 
Co3: white
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9
Q

Test: FeCl3?

A 
S2O2: purple 
SO4: no ppt
Cl: -ve 
Br: -ve
I: brown 
CO3: -ve
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10
Q

Test: FeCl3?

A 
S2O2: purple 
SO4: no ppt
Cl: -ve 
Br: -ve
I: brown 
CO3: -ve
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11
Q

Test: K2Cr2O7

A 
S2O2: orange to green
SO4: -ve
Cl: -ve
Br: -ve
I: -ve
CO3:-ve
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12
Q

Test: solid + conc. H2SO4

A 
S2O2: -ve
SO4: -ve
Cl: colourless gas
Br: brown fumes
I: violet fumes
CO3: -ve
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13
Q

Chlorine water test?

A 
S2O2: -ve
SO4: -ve
Cl: -ve
Br: orange colour in the bottom layer 
I: violet colour in bottom layer 
CO3: -ve
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14
Q

Ag/Pb test?

A

Cold dil. HCl= white ppt add water and boil
Ag: white will not dissolve
Pb: white will dissolve

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14
Q

Ag/Pb test?

A

Cold dil. HCl= white ppt add water and boil
Ag: white will not dissolve
Pb: white will dissolve

15
Q

Cu/Cd test?

A

H2S in presence of 0.25 HCl
Cu: dark ppt
Cd: yellow ppt

Chem Lab (1 decks)

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