Barium sulphate can be made by mixing solutions containing the barium and sulphate ions. The net ionic equation for this reaction is Bast") + so 2-...

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34. Barium sulphate can be made by mixing solutions containing the bariumand sulphate ions. The net ionic equation for this reaction is Bast“) + so 2- —> BaSO 4 {aq) 4 {5) Patients requiring a stomach X—ray are often asked to consume a largecontainer of a barium sulphate suspension (a mixture of solid bariumsulphate and water) prior to the procedure. This helps to make the stomachand esophagus more visible in the X—ray. Barium ions are toxic but barium sulphate is safe to consume.(4 marks: 2 marks each) a) Which ion is the limiting reagent and which is the reagent in excesswhen barium sulphate is made? Justify your prediction. b) Why is it important to prepare the barium sulphate mixture asaccurately as possible?