Question

When ferrous sulphate $\left({\text{FeSO}}_4\right)$ solution combines with sodium hydroxide $\text{(NaOH)}$, the chemical change is identified by the .

• A. absoprtion of heat
• B. formation of ppt
• C. formation of gas

Answer 1

The correct option is B formation of ppt

When sodium hydroxide is added to ferrous sulphate solution, a dirty green coloured precipitate (ppt) of ferrous hydroxide, ${\text{Fe(OH)}}_2$, is formed.

This confirms that a chemical change, i.e., a chemical reaction has occurred.
$FeS{O}_4\left(aq\right)+2NaOH\left(aq\right)\to Fe\left(OH{)}_2\right(s)+N{a}_{2}S{O}_4(aq)$