12 g of an impure sample of arsenious oxide was dissolved in water containing 7.5 g…
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Problem
12 g of an impure sample of arsenious oxide was dissolved in water containing 7.5 g of sodium bicarbonate and the resulting solution was diluted to 250 mL. 25 mL of this solution was completely oxidized by 22.4 mL of a solution of iodine. 25 mL of this iodine solution reacted with same volume of a solution containing 24.8g of sodium thiosulphate ( Na2S2O3⋅5H2O ) in one litre. Calculate the percentage of arsenious oxide in the sample. (Atomic mass of As = 75)