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Testing for cations Flashcards

(8 cards)

1
Q

Testing for Cr 3+

A

NaOH - Green precipitate, dissolves in excess
NH3 - Grey-green precipitate, excess has no effect

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2
Q

Testing for Cu 2+

A

NaOH - Pale blue precipitate, excess has no effect
NH3 - Pale blue precipitate, dissolves in excess, deep blue solution

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3
Q

Testing for Ca 2+

A

NaOH - White precipitate, excess has no effect
NH3 - Very slight precipitate or none

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4
Q

Testing for Al 3+

A

NaOH - White precipitate, dissolves in excess, gives colourless solution
NH3 - White precipitate, excess has no effect

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5
Q

Testing for Fe 2+

A

EITHER NaOH/NH3 –> pale green precipitate

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6
Q

Testing for Fe 3+

A

EITHER NaOH/NH£ –> red-brown precipitate

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7
Q

Testing for Zn 2+

A

White precipitate, dissolves in excess of both NaOH and NH3

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8
Q

Testing for NH4+

A

Add NaOH and heat, NH3 given off (turns litmus paper blue)

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