Barium Perchlorate VS

Barium Perchlorate VS Ba(ClO₄)₂ = 336.2

For a 0.05m solution Dissolve 15.8 g of barium hydroxide in a mixture of 75 mL of water and 7.5 mL of perchloric acid, adjust to pH 3 with perchloric acid and filter if necessary. To the solution add 150 mL of ethanol (96%), dilute to 250 mL with water and add sufficient buffer solution pH 3.7 to produce 1000 mL.

Ascertain its exact concentration immediately before use in the following manner. To 5 mL of 0.05m sulfuric acid VS add 5 mL of water, 50 mL of acetate buffer pH 3.7 and 0.5 mL of alizarin S solution and titrate with the barium perchlorate solution until an orange-red colour appears. Each mL of 0.05m sulfuric acid VS is equivalent to 16.81 mg of Ba(ClO₄)₂.

For a 0.025m solution Dilute 500 mL of 0.05m barium perchlorate VS to 1000 mL with buffer solution pH 3.7.