What visible change occurs when aqueous solutions of sodium sulphate and barium chloride are mixed?
Answer and explanation
Correct answer: A white precipitate forms
On mixing the solutions, a double-displacement reaction occurs: \(\mathrm{Na_2SO_4(aq) + BaCl_2(aq) \rightarrow BaSO_4(s) + 2NaCl(aq)}\). Barium sulphate, \(\mathrm{BaSO_4}\), is insoluble in water, so it appears as a white precipitate. Evolution of a brown gas is not a feature of this reaction.
Frequently asked questions
What is the correct answer to this question?
A white precipitate forms
Why is this the correct answer?
On mixing the solutions, a double-displacement reaction occurs: \(\mathrm{Na_2SO_4(aq) + BaCl_2(aq) \rightarrow BaSO_4(s) + 2NaCl(aq)}\). Barium sulphate, \(\mathrm{BaSO_4}\), is insoluble in water, so it appears as a white precipitate. Evolution of a brown gas is not a feature of this reaction.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: Chemical Substances – Nature and Behaviour. Topic: Chemical Reactions and Equations.
