What is the initial colour of the precipitate formed when iron(II) ions react with sodium hydroxide?

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Study for the IGCSE Edexcel Chemistry Test. Access flashcards and multiple choice questions with hints and explanations. Get ready for your exam!

Multiple Choice

What is the initial colour of the precipitate formed when iron(II) ions react with sodium hydroxide?

Explanation:
When iron(II) ions meet hydroxide ions, they form iron(II) hydroxide, which is insoluble and appears as a green precipitate. The reaction is Fe2+ + 2 OH− → Fe(OH)2(s). The green color reflects the Fe(II) state of the compound. If the precipitate is left in air, Fe(II) can be oxidized to Fe(III), giving Fe(OH)3, which is orange-brown, so the color can darken over time. Other colors would come from different species, but the immediate product with Fe2+ and OH− is green.

When iron(II) ions meet hydroxide ions, they form iron(II) hydroxide, which is insoluble and appears as a green precipitate. The reaction is Fe2+ + 2 OH− → Fe(OH)2(s). The green color reflects the Fe(II) state of the compound. If the precipitate is left in air, Fe(II) can be oxidized to Fe(III), giving Fe(OH)3, which is orange-brown, so the color can darken over time. Other colors would come from different species, but the immediate product with Fe2+ and OH− is green.

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