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The iodine liberated by the reaction 2FeCl + 2HI = 2HCl + 2FeCl + I is reduced by the addition of 50 cc. of sodium thiosulphate solution and the excess thiosulphate is titrated with standard iodine and requires 7.85 cc. 45 cc. I solution = 45.95 cc. Na S O solution; 45 cc. As O solution = 45.27 cc. I solution. 1 cc. arsenite solution = 0.005160 gram As O . !Answer!: 23.77%.
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