What is the colour of the precipitate produced by iron(III) ions on reaction with sodium hydroxide?

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Multiple Choice

What is the colour of the precipitate produced by iron(III) ions on reaction with sodium hydroxide?

Explanation:
When iron(III) ions meet hydroxide ions from sodium hydroxide, they form an insoluble iron(III) hydroxide precipitate, Fe(OH)3. This solid has an orange-brown color, often described as brownish-orange, which is characteristic of Fe(OH)3. The color comes from the iron(III) in the solid and how the hydroxy oxide forms its colored lattice. If iron were in the +2 state, you’d get green Fe(OH)2 instead, and many other metal hydroxides are white, so the brown color specifically signals Fe3+.

When iron(III) ions meet hydroxide ions from sodium hydroxide, they form an insoluble iron(III) hydroxide precipitate, Fe(OH)3. This solid has an orange-brown color, often described as brownish-orange, which is characteristic of Fe(OH)3. The color comes from the iron(III) in the solid and how the hydroxy oxide forms its colored lattice. If iron were in the +2 state, you’d get green Fe(OH)2 instead, and many other metal hydroxides are white, so the brown color specifically signals Fe3+.

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