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chem qualitative analysis > test for cations > Flashcards

test for cations Flashcards

1
Q

NaOH (aq) on aluminium Al3+

A

white ppt

soluble in excess, giving a colourless solution

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2
Q

NaOH (aq) on lead(II) Pb2+

A

white ppt

soluble in excess, giving a colourless solution

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3
Q

NaOH (aq) on zinc Zn2+

A

white ppt

soluble in excess, giving a colourless solution

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4
Q

NaOH (aq) on calcium Ca2+

A

white ppt

insoluble in excess

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5
Q

NaOH (aq) on on copper(II) Cu2+

A

light blue ppt

insoluble in excess

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6
Q

NaOH (aq) on iron (II) Fe2+

A

green ppt

insoluble in excess

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7
Q

NaOH (aq) on iron (III) Fe3+

A

red-brown ppt

insoluble in excess

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8
Q

NaOH (aq) on ammonium (NH4+)

A

ammonia produced on warming

no change observed in excess

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9
Q

NH3 (aq) on aluminium Al3+

A

white ppt

insoluble in excess

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10
Q

NH3 (aq) on lead (II) Pb2+

A

white ppt

insoluble in excess

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11
Q

NH3 (aq) on iron (II) Fe2+

A

green ppt

insoluble in excess

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12
Q

NH3 (aq) on iron (III) Fe3+

A

red-brown ppt

insoluble in excess

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13
Q

NH3 (aq) on zinc Zn2+

A

white ppt

soluble in excess, giving a colourless solution

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14
Q

NH3 (aq) on copper (II) Cu2+

A

light blue ppt

soluble in excess, giving a dark blue solution

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15
Q

NH3 (aq) on calcium Ca2+

A

no visible reaction

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16
Q

how to distinguish lead (II) Pb2+ from aluminium Al3+

A

Add potassium iodide KI
lead(II): yellow ppt
aluminium: no ppt

lead(II) chloride insoluble

chem qualitative analysis (5 decks)

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