Barium sulfate, BaSO4\text{BaSO}_4BaSO4, is an insoluble salt.
It can be made as a precipitate from a solution of barium chloride, BaCl2\text{BaCl}_2BaCl2.
Identify a substance that could be added to barium chloride solution to form a precipitate of barium sulfate.
Write a chemical equation for the reaction between barium chloride and the substance you identified in (a)(i).
Outline how you would produce a pure, dry sample of barium sulfate from the reaction mixture in (a)(ii).
A solution of barium chloride can be made by reacting solid barium carbonate with dilute hydrochloric acid.
The equation for this reaction is:
BaCO3(s)+2HCl(aq)→BaCl2(aq)+CO2(g)+H2O(l) \text{BaCO}_3(\text{s}) + 2\text{HCl}(\text{aq}) \rightarrow \text{BaCl}_2(\text{aq}) + \text{CO}_2(\text{g}) + \text{H}_2\text{O}(\text{l}) BaCO3(s)+2HCl(aq)→BaCl2(aq)+CO2(g)+H2O(l)State two observations you would make when dilute hydrochloric acid is added to solid barium carbonate.
