Calculate the percentage of available chlorine in a given sample of bleaching powder from the following data : 3.55 g of bleaching powder when treated with acetic acid and excess of KI liberated iodine which required 60 mL of 0.5 N sodium thiosulphate solution.
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`60 mL 0.5 N Na_(2)S_(2)O_(3)-=60 mL 0.5 N I_(2)` `-=60 mL 0.5 N Cl_(2)` Amount of chlorine `=(35.5xx0.5)/(1000)xx60=1.065 g` % of available chlorine `=(1.065)/(3.55)xx100=30.0`
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