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The number "N" of cubic centimeters of hyposulfite employed multiplied by 1,775 will give the weight "N" of active chloride contained in 100 grammes of chloride of lime.

Measure 10 c.c. of the solution, add 20 c.c. of potassium iodide 1/10, 2 c.c. of acetic acid and drop by drop a decinormal solution of sodium hyposulfite until decoloration.