Hydroxide Precipitates Flashcards by Alex Law

Q

How is this test carried out?

A

Sample put in test tube

Few drops of dilute sodium hydroxide solution added

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Q

Colour of precipitate for Calcium ions

A

White

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Q

Colour of precipitate for copper ions

A

Blue

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Q

Colour of precipitate for Iron(II) ions

A

Blue

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Q

Colour of precipitate for aluminium ions

A

White

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Q

Colour of iron(III) ions precipitate

A

Brown

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Q

what happens to aluminium hydroxide precipitate when excess dilute sodium hydroxide is added?

A

The precipitate dissolves - forming a colourless compound - this can be used to distinguish between testing for calcium ions and magnesium ions

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