test for cations Flashcards by YVETTE LOW EE SIAN ZANNA | Brainscape

Q

NaOH (aq) on aluminium Al3+

A

white ppt

soluble in excess, giving a colourless solution

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Q

NaOH (aq) on lead(II) Pb2+

A

white ppt

soluble in excess, giving a colourless solution

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Q

NaOH (aq) on zinc Zn2+

A

white ppt

soluble in excess, giving a colourless solution

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Q

NaOH (aq) on calcium Ca2+

A

white ppt

insoluble in excess

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Q

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

A

light blue ppt

insoluble in excess

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Q

NaOH (aq) on iron (II) Fe2+

A

green ppt

insoluble in excess

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Q

NaOH (aq) on iron (III) Fe3+

A

red-brown ppt

insoluble in excess

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Q

NaOH (aq) on ammonium (NH4+)

A

ammonia produced on warming

no change observed in excess

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Q

NH3 (aq) on aluminium Al3+

A

white ppt

insoluble in excess

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Q

NH3 (aq) on lead (II) Pb2+

A

white ppt

insoluble in excess

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Q

NH3 (aq) on iron (II) Fe2+

A

green ppt

insoluble in excess

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Q

NH3 (aq) on iron (III) Fe3+

A

red-brown ppt

insoluble in excess

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Q

NH3 (aq) on zinc Zn2+

A

white ppt

soluble in excess, giving a colourless solution

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Q

NH3 (aq) on copper (II) Cu2+

A

light blue ppt

soluble in excess, giving a dark blue solution

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Q

NH3 (aq) on calcium Ca2+

A

no visible reaction

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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