Question

What is a chemical equation? Why are chemical equations balanced? Write a balanced chemical equation with state symbols for the following reaction:
Solutions of barium chloride and sodium sulphate in water react to give insoluble barium sulphate and the solution of sodium chloride.

Answer 1

A chemical equation is a symbolic representation of the process that occurs in a chemical reaction. A chemical equation is written with the reactants on the left side of an arrow and the products of the chemical reaction on the right side of the equation.
The law of conservation of mass states that mass can neither be created nor be destroyed. Hence, in a chemical reaction, the total mass of the reactants should be equal to the total mass of the products.
Balanced chemical equation: ${\mathrm{BaCl}}_2\left(\mathrm{aq}\right)+{\mathrm{Na}}_2{\mathrm{SO}}_4\left(\mathrm{aq}\right)\to 2\mathrm{NaCl}\left(\mathrm{aq}\right)+{\mathrm{BaSO}}_4\left(\mathrm{s}\right)$