Question

What can be inferred from the following equation?

${\text{Na}}_2{\text{SO}}_4\left(\text{aq}\right)+{\text{BaCl}}_2\left(\text{aq}\right)\to {\text{BaSO}}_4\left(\text{s}\right)+2\text{NaCl}\left(\text{aq}\right)$.

• A. $\text{NaCl}$ dissolves in water.
• B. ${\text{BaSO}}_4$ is precipitate.
• C. It is a double displacement reaction.
• D. It is a precipitation reaction.

Answer 1

Answer: (A), (B), (C), (D)

The correct options are
A $\text{NaCl}$ dissolves in water.
B ${\text{BaSO}}_4$ is precipitate.
C It is a double displacement reaction.
D It is a precipitation reaction.

${\text{Na}}_2{\text{SO}}_4\left(\text{aq}\right)+{\text{BaCl}}_2\left(\text{aq}\right)\to {\text{BaSO}}_4\left(\text{s}\right)+2\text{NaCl}\left(\text{aq}\right)$.

In above reaction, ${\text{Na}}^{+}$ and ${\text{Ba}}^{2+}$ ions are exchanged between the reactants, hence it is a double displacement reaction.

The product ${\text{BaSO}}_4$ is not soluble in water, so it is a precipitate. This reaction is also called precipitation reaction due to the formation of a precipitate. $\text{NaCl}$ dissolves in water.