Question

Give your observation along with equations :

When sulphuric acid is added to barium 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
• $\mathrm{AB}+\mathrm{CD}\stackrel{}{\to }\mathrm{AD}+\mathrm{BC}$
• For example when sulphuric acid(${\mathrm{H}}_2{\mathrm{SO}}_4$) reacts with barium chloride(${\mathrm{BaCl}}_2$), they undergo a mutual exchange of their radicals.
• $\underset{\mathrm{barium}\mathrm{chloride}}{{\mathrm{BaCl}}_2\left(\mathrm{aq}\right)}+\underset{\mathrm{sulphuric}\mathrm{acid}}{{\mathrm{H}}_2{\mathrm{SO}}_4\left(\mathrm{aq}\right)}\stackrel{}{\to }\underset{\mathrm{barium}\mathrm{sulphate}}{{\mathrm{BaSO}}_4\left(\mathrm{s}\right)}\downarrow +\underset{\mathrm{hydrochloric}\mathrm{acid}}{2\mathrm{HCl}\left(\mathrm{aq}\right)}$
• The above reaction is also a precipitation reaction.