Write a balanced chemical equation with state symbols for the following reaction:

(I) Solutions of Barium chloride and Sodium sulphate in water react to give insoluble Barium sulphate and a solution of Sodium chloride.

Balanced chemical reaction:

• A balanced chemical reaction is a reaction in which the number of atoms in the reactant and the product's side should be an equal number.
• It obeys the law of conservation of mass and momentum.

Reaction:

• When barium chloride reacts with sodium sulphate gives a precipitate of barium sulphate and sodium chloride.

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

• This is the balanced reaction:

Element	Reactant	Product
$\mathrm{Ba}$	$1$	$1$
$\mathrm{Cl}$	$2$	$2$
$\mathrm{Na}$	$2$	$2$
$\mathrm{S}$	$1$	$1$
$\mathrm{O}$	$4$	$4$

• Insoluble barium sulphate and sodium chloride solution are generated when an aqueous sodium sulphate solution combines with an aqueous barium chloride solution.
• If the reactants are solid, the reaction between sodium sulphate and barium chloride will not take place.
• When an aqueous solution of sodium sulphate combines with an aqueous solution of barium chloride, a two-fold displacement reaction occurs i.e.double displacement reaction.