Metal Hydroxide Precipitates Quiz

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Questions and Answers

What color is Iron(II) hydroxide when initially formed?

Colorless
Greenish (correct)
Reddish-brown
White

Aluminium hydroxide is a reddish-brown precipitate.

False (B)

What happens to Iron(II) hydroxide when it is left to stand?

It turns brown due to oxidation.

Iron(III) hydroxide is represented chemically as ______.

<p>Fe(OH)3</p> Signup and view all the answers

Match the following hydroxides with their corresponding colors:

<p>Iron(II) hydroxide = Reddish-brown Iron(III) hydroxide = Greenish Aluminium hydroxide = White Aluminium hydroxide in excess alkali = Clear solution</p> Signup and view all the answers

Flashcards

Iron(II) hydroxide color

Greenish, turns brown upon oxidation

Iron(III) hydroxide color

Reddish-brown precipitate

Aluminum hydroxide color

White precipitate, soluble in excess hydroxide

Iron(II) Nitrate + Sodium Hydroxide reaction product color

Greenish precipitate of Iron(II) hydroxide

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Iron(III) Chloride + Sodium Hydroxide reaction product color

Reddish-brown precipitate of Iron(III) hydroxide

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Study Notes

Metal Hydroxide Precipitates

Iron(II) hydroxide, Fe(OH)₂: forms a greenish precipitate that changes to brown over time due to oxidation.
Iron(III) hydroxide, Fe(OH)₃: forms a reddish-brown precipitate.
Aluminum hydroxide, Al(OH)₃: forms a white precipitate; it dissolves in excess sodium hydroxide solution, forming a clear solution.

Reaction Products

Sodium nitrate (NaNO₃) and Iron(II) hydroxide (Fe(OH)₂) result from the reaction of Iron(II) nitrate with Sodium hydroxide.
Sodium chloride (NaCl) and Iron(III) hydroxide (Fe(OH)₃) result from the reaction of Iron(III) chloride with Sodium hydroxide.
Sodium chloride (NaCl) and Aluminum hydroxide (Al(OH)₃) result from the reaction of Aluminum chloride with Sodium hydroxide.