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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%.
The latter object is accomplished by oxidation to stannic chloride by means of mercuric chloride added in excess, as the mercuric salts have no effect upon ferrous iron or the bichromate. The reactions involved are: 2FeCl + SnCl > 2FeCl + SnCl SnCl + 2HgCl > SnCl + 2HgCl The mercurous chloride is precipitated.
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