Write a balanced chemical equation with state symbols for the
following reactions.
(i) Solutions of barium chloride and sodium sulphate in water react
to give insoluble barium sulphate and the solution of sodium
chloride.
(ii) Sodium hydroxide solution (in water) reacts with hydrochloric
acid solution (in water) to produce sodium chloride solution and
water
Answers
Answer:
The representation of a chemical reaction in the form of substances is known as a chemical equation. The equation in which the number of atoms of all the molecules is equal on both sides of the equation is known as a balanced chemical equation.
(i) BaCl2 + Na2SO4 → BaSO4 + 2NaCl
When an aqueous sodium sulphate solution reacts with an aqueous barium chloride solution, insoluble barium sulphate and sodium chloride solution are formed. The reaction between sodium sulphate and barium chloride will not occur if the reactants are solid. A double displacement reaction occurs when an aqueous solution of sodium sulphate reacts with an aqueous solution of barium chloride.
(ii) NaOH + HCl → NaCl + H2O
When sodium hydroxide reacts with hydrochloric acid it gives sodium chloride salt and water. It is an example of neutralisation reaction in which an acid reacts with a base to form salt and water.
(I) BaCl2 + Na2SO4 → BaSO4 + 2NaCl
(II) NaOH + HCl → NaCl + H2O