Скачать или смотреть Test for Iron(III) Ions | Brown Precipitate | AQA GCSE Chemistry (9-1)

This video demonstrates the definitive chemical test for iron(III) ions (Fe³⁺) in solution using sodium hydroxide (NaOH), a key identification method for your AQA GCSE Chemistry exam.

When sodium hydroxide solution is added to a solution containing iron(III) ions, a distinctive brown precipitate is formed. This solid is iron(III) hydroxide, Fe(OH)₃, which is insoluble in water.

This reaction is a crucial part of the AQA specification, section 4.8.3.2 Metal hydroxides, which states that "Solutions of... iron(III) ions form coloured precipitates when sodium hydroxide solution is added... iron(III) a brown precipitate."

The ionic equation for this precipitation reaction is:

Fe³⁺(aq) + 3OH⁻(aq) ⟶ Fe(OH)₃(s)

Disclaimer: This is an AI-generated animation created to provide a safe and clear demonstration of this important precipitation reaction.

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