1) What happens when barium chloride is added to a sodium sulphate solution? What's the equation?
2) What happens when calcium chloride is added to a sodium sulphate solution? What's the equation?
3) Between the calcium sulphate and the barium sulphate, which Ksp has the smaller value and why?
4) What happens when sulphuric acid is added to a sodium sulphate solution? What's the equation?