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Questions and Answers
What color does Iron(II) hydroxide turn upon standing?
What color does Iron(II) hydroxide turn upon standing?
- Red
- Greenish
- White
- Brown (correct)
Iron(III) hydroxide is a white precipitate.
Iron(III) hydroxide is a white precipitate.
False (B)
What is the chemical formula for Sodium nitrate?
What is the chemical formula for Sodium nitrate?
NaNO3
Aluminium hydroxide (
*Al(OH)_3
) is a ______ precipitate that can dissolve in excess sodium hydroxide.
Aluminium hydroxide ( *Al(OH)_3 ) is a ______ precipitate that can dissolve in excess sodium hydroxide.
Match the following products with their characteristics:
Match the following products with their characteristics:
Flashcards
Iron(II) hydroxide color
Iron(II) hydroxide color
Greenish precipitate that turns brown upon standing.
Iron(III) hydroxide color
Iron(III) hydroxide color
A reddish-brown precipitate.
Aluminum hydroxide color
Aluminum hydroxide color
White precipitate, soluble in excess hydroxide.
Iron(II) hydroxide formula
Iron(II) hydroxide formula
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Iron(III) hydroxide formula
Iron(III) hydroxide formula
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Study Notes
Metal Hydroxide Precipitates
- Iron(II) hydroxide (Fe(OH)â‚‚) forms a greenish precipitate. It oxidizes to a brown color over time.
- Iron(III) hydroxide (Fe(OH)₃) forms a reddish-brown precipitate.
- Aluminium hydroxide (Al(OH)₃) forms a white precipitate. This precipitate dissolves in excess sodium hydroxide forming a clear solution.
Reaction Products
- Iron(II) nitrate + Sodium hydroxide → Iron(II) hydroxide + Sodium nitrate produces a greenish precipitate of iron(II) hydroxide and colorless sodium nitrate solution. The iron(II) hydroxide darkens to brown over time.
- Iron(III) chloride + Sodium hydroxide → Iron(III) hydroxide + Sodium chloride yields a reddish-brown precipitate of iron(III) hydroxide and colorless sodium chloride solution.
- Aluminium chloride + Sodium hydroxide → Aluminium hydroxide + Sodium chloride creates a white precipitate of aluminium hydroxide along with a colorless sodium chloride solution. The aluminium hydroxide is soluble in excess sodium hydroxide.
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