Podcast
Questions and Answers
What color is Iron(II) hydroxide when initially formed?
What color is Iron(II) hydroxide when initially formed?
Aluminium hydroxide is a reddish-brown precipitate.
Aluminium hydroxide is a reddish-brown precipitate.
False
What happens to Iron(II) hydroxide when it is left to stand?
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 ______.
Iron(III) hydroxide is represented chemically as ______.
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Match the following hydroxides with their corresponding colors:
Match the following hydroxides with their corresponding colors:
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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.
Observations Explained
- The different colors of the precipitates are important indicators of the metal ion present in the reaction.
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Description
Test your knowledge on metal hydroxide precipitates with this quiz! Learn about the different colors and reactions of iron and aluminum hydroxides. Discover how to identify various metal ions based on their precipitate colors.
