Bleaching powder and bleach solution are produced on a large scale and used in several hous-hold products. The effectiveness of bleach solution id often measured by iodometry.
`25 mL` of household bleach solution was mixed with `30 mL` of `0.50 M KI` and `10 mL` of `4N` acetic acid. In the titration of the liberated iodine, `48 mL` of `0.25 N Na_(2)S_(2)O_(3)` was used to reach the end point. The molarity of the household bleach solution is :

Answer

3

Explanation

Number of millimole of hypo `=0.25 xx 48 =2 xx` millimole of `Cl_(2)`
`therefore` Number of millimole of `Cl_(2) =(0.25 xx 48)/2 = 6`
millmole of `Cl_(2)` = millimole of `CaOCl_(2)`
Molarity of bleaching solution
`=("Millimoles of" CaOCl_(2))/("Vol in ml of" CaOCl_(2)) = 6/25 = 0.24`