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QA Cations Flashcards

(9 cards)

1
Q

Aluminium (AL3+)
NaOH (aq) :
NH3 (aq) :

A

NaOH (aq) : white ppt, soluble in excess giving colourless soln
NH3 (aq) : white ppt, insoluble in excess

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2
Q

Ammonium (NH4+)
NaOH (aq) :
NH3 (aq) :

A

NaOH (aq) : ammonia produced on warming

NH3 (aq) : -

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3
Q

Calcium (Ca2+)
NaOH (aq) :
NH3 (aq) :

A

NaOH (aq) : white ppt, insoluble in excess

NH3 (aq) : no ppt

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4
Q

Copper(II) (Cu2+)
NaOH (aq) :
NH3 (aq) :

A

NaOH (aq) : Light blue ppt, insoluble in excess

NH3 (aq) : light blue ppt, soluble in excess giving dark blue soln

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5
Q

Iron (II) (Fe2+)
NaOH (aq) :
NH3 (aq) :

A

NaOH (aq) : green ppt, insoluble in excess

NH3 (aq) : green ppt, insoluble in excess

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6
Q

Iron (III) (Fe3+)
NaOH (aq) :
NH3 (aq) :

A

NaOH (aq) : red-brown ppt, insoluble in excess

NH3 (aq) : red-brown ppt, insoluble in excess

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7
Q

Lead (II) (Pb2+)
NaOH (aq) :
NH3 (aq) :

A

NaOH (aq) : white ppt, soluble in excess giving colourless soln
NH3 (aq) : white ppt, insoluble in excess

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8
Q

Zinc (Zn2+)
NaOH (aq) :
NH3 (aq) :

A

NaOH (aq) : white ppt, soluble in excess giving colourless soln
NH3 (aq) : white ppt, soluble in excess giving colourless soln

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9
Q

How can Pb2+ be distinguished from Al3+

A

insolubility of lead (II) iodide or lead (II) chloride

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