Question

The reaction between barium chloride and sodium sulphate goes to completion because:
A. Barium sulphate is almost insoluble
B. The solubility of barium chloride decrease
C. Lattice energy of barium sulphate is very high
D. The reaction is irreversible in nature

Answer 1

The given reaction between barium chloride and sodium sulphate is an example of precipitation reaction where a solid product is obtained. In this question, the answer contains more than one option.

Complete step by step answer:
The reaction when two aqueous solutions dissolve and react with each other to form a solid product and an aqueous solution.
The solid compound which does not dissolve in the water and gets settled down in the bottom of the solution is called precipitate.
The aqueous solution is defined as the solution where the compound is soluble in the solvent.
The reaction of barium chloride and sodium sulphate is shown below.
$BaC{l_2}(aq) + N{a_2}S{O_4}(aq) \to BaS{O_4}(s) + 2NaCl(aq)$
In this reaction, one mole of aqueous solution of barium chloride reacts with one mole of aqueous solution of sodium sulphate to form solid barium sulphate and aqueous solution of sodium chloride.
The given reaction is an irreversible reaction which means that the reaction cannot be reversed back (reactants cannot be obtained from the product) due to the formation of solid barium sulphate.
Thus, the reaction between barium chloride and sodium sulphate goes to completion because barium sulphate is almost insoluble and the reaction is irreversible in nature.
Therefore, the correct option is A and D.

Note:
The sulphate ion which is originally from the reactant sodium sulphate is now present in barium sulphate which is in the form of precipitate and is insoluble in the solution.