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chemistry > qualitative analysis: cation tests > Flashcards

qualitative analysis: cation tests Flashcards

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1
Q

NH4+ (ammonium) tested with NaOH

A

no ppt formed. on heating, gas evolved turns moist red litmus paper blue. the gas is NH3

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2
Q

Ca2+ tested with NaOH

A

a white ppt formed, insoluble in excess aqueous NaOH

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3
Q

Ca2+ tested with NH3

A

no ppt is formed

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4
Q

Al3+ tested with NaOH

A

a white ppt formed. the ppt is soluble in excess aqueous NaOH to form a colourless solution

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5
Q

Al3+ tested with NH3

A

a white ppt formed, insoluble in excess aqueous NH3

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6
Q

Pb2+ tested with NaOH

A

a white ppt formed. the ppt is soluble in excess aqueous NaOH to form a colourless solution

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7
Q

Pb2+ tested with NH3

A

a white ppt formed, insoluble in excess aqueous NH3

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8
Q

Zn2+ tested with NaOH

A

a white ppt formed. the ppt is soluble in excess aqueous NaOH to form a colourless solution

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9
Q

Zn2+ tested with NH3

A

a white ppt formed. the ppt is soluble in excess aqueous NH3 to form a colourless solution

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10
Q

Cu2+ tested with NaOH

A

a light blue ppt formed, insoluble in excess aqueous NaOH

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11
Q

Cu2+ tested with NH3

A

a blue ppt formed. the ppt is soluble in excess aqueous NH3 to form a dark blue solution

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12
Q

Fe2+ tested with NaOH

A

a green ppt formed, insoluble in excess aqueous NaOH

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13
Q

Fe2+ tested with NH3

A

a green ppt is formed, insoluble in excess aqueous NH3

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14
Q

Fe3+ tested with NaOH

A

a reddish-brown ppt formed, insoluble in excess aqueous NaOH

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15
Q

Fe3+ tested with NH3

A

a reddish-brown ppt formed, insoluble in excess aqueous NH3

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16
Q

Na+ and K+ in NaOH

A

no visible reaction (no gas, no ppt)

chemistry (10 decks)

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