Question

The name and the colour of the precipitate formed when sodium hydroxide is added to $FeC{l}_3$ is ___ and ___ respectively.

• A. Sodium ferrate, colourless
• B. Sodium chloride, golden
• C. Iron(II) hydroxide, dark brown
• D. Iron(III) hydroxide, reddish brown

Answer 1

The correct option is D Iron(III) hydroxide, reddish brown

NaOH reacts with ${\text{FeCl}}_3$ to give sodium chloride and iron(III) hydroxide, which is reddish brown in colour is precipitated, as shown below:

${\text{FeCl}}_3\left(aq\right)+3\text{NaOH}\left(aq\right)\to 3\text{NaCl}\left(aq\right)+{\text{Fe(OH)}}_3\downarrow$