Question

Give your observation along with equation

When sodium hydroxide is added to ferrous chloride.

Answer 1

Double displacement reaction:

• It is a chemical reaction in which two compounds in their aqueous solutions react to form two new compounds by the mutual exchange of their radicals.
• In a general double decomposition, the reaction can be represented as
• $\mathrm{AB}+\mathrm{CD}\stackrel{}{\to }\mathrm{AD}+\mathrm{BC}$
• When sodium hydroxide($\mathrm{NaOH}$) is added to ferric chloride(${\mathrm{FeCl}}_2$) solution, a reddish brown precipitate is formed.
• $\underset{\mathrm{sodium}\mathrm{hydroxide}}{2\mathrm{NaOH}\left(\mathrm{aq}\right)}+\underset{\mathrm{ferric}\mathrm{chloride}}{{\mathrm{FeCl}}_2\left(\mathrm{s}\right)}\stackrel{}{\to }\underset{\mathrm{ferric}\mathrm{hydroxide}}{\mathrm{Fe}{\left(\mathrm{OH}\right)}_2\left(\mathrm{s}\right)}+\underset{\mathrm{sodium}\mathrm{chloride}}{2\mathrm{NaCl}\left(\mathrm{aq}\right)}$