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Household bleach contains hypochlorite ...

Household bleach contains hypochlorite ion,which is formed when chlorine dissolves in water. The determine the concentration of hypochlorite in the bleach,the solution is first treated with a KI solution.The iodine liberated can be determined by titration with a standard thiosulphate solution.A 25 ml of certain household bleach requires "17.4ml" of a 0.2M-`Na_(2)S_(2)O_(3)` solution for titration.The mass of chlorine dissolved in one litre of the bleach solution is

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