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

Unlock all questions

This demo includes only 20 questions. Upgrade to access hundreds of questions, flashcards, exam simulations, and disable ads.

Full question bankExam simulationsFlashcards
From $24.99Unlock all

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 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+.

More Multiple Choice Questions
Subscribe

Get the latest from Examzify

You can unsubscribe at any time. Read our privacy policy