Question

When a solution of Barium chloride (BaCl₂) in water is added to the aqueous solution of Sodium sulphate (Na₂SO₄) the following happens

• A. A white precipitate is formed
• B. A red precipitate is formed
• C. The color of the solution turn blue
• D. The pungent smelling gas is evolved

Answer 1

The correct option is A

A white precipitate is formed

Precipitation reaction:

• It is a type of double displacement reaction.
• Some chemical reactions are characterized by the formation of a precipitate (an insoluble substance) when the solutions of two soluble chemical compounds are mixed together.
• When a solution of Barium Chloride (BaCl₂) in water is added to the aqueous solution of sodium sulphate(Na₂SO₄), a white precipitate of barium sulphate forms along with aqueous sodium chloride salt.
• Balanced chemical reaction equation:

$\underset{\mathrm{Barium}\mathrm{Chaloride}}{{\mathrm{BaCl}}_2\left(\mathrm{aq}\right)}+\underset{\mathrm{Sodium}\mathrm{Sulphate}}{{\mathrm{Na}}_2{\mathrm{SO}}_4\left(\mathrm{aq}\right)}\to \underset{\underset{(\mathrm{White}\mathrm{precipitate})}{\mathrm{Barium}\mathrm{sulphate}}}{{\mathrm{BaSO}}_4\left(\mathrm{s}\right)\downarrow }+\underset{\mathrm{Sodium}\mathrm{Chloride}}{2\mathrm{NaCl}\left(\mathrm{aq}\right)}$

Hence, Option(A) is correct option.