Barium hydroxide and sulfuric acid react according to the following equation: Ba(OH)₂(aq) + H₂SO₄(aq) → BaSO₄(s) + 2H₂O(l) (a) Name this type of chemical reaction - HSC - SSCE Chemistry - Question 21 - 2001 - Paper 1

Initially, the conductivity decreases as sulfuric acid is added. This is because the reaction forms barium sulfate, a solid precipitate that reduces the concentration of ions in solution. As more sulfuric acid is added and the reaction approaches completion, there will be fewer hydroxide ions and an increase in sulfate ions, which leads to a gradual increase in conductivity. Once all barium hydroxide is consumed, the conductivity stabilizes at a higher value due to the presence of additional sulfate ions in solution.