Some Metals Form a Coloured Precipitate with NaOH Flashcards

1
Q

What are many metal hydroxides and what do they do when formed?

A

Insoluble and precipitate out of solution when formed

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2
Q

What do some of these hydroxides have?

A

A characteristic colour

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3
Q

What do you do in this test?

A

Add a few drops of sodium hydroxide solution to a solution of the mystery compound in a test tube

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4
Q

How can you tell which metal was in the compound?

A

If you get a coloured insoluble hydroxide

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5
Q

Copper(II)

A

Blue: Cu²+ + 2OH- —> Cu(OH)2

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6
Q

Iron(II)

A

Sludgy green: Fe²+ + 2OH- —> Fe(OH)2

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7
Q

Iron(III)

A

Reddish brown: Fe³ + 3OH- —> Fe(OH)3

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