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 :

Options

A. 0.48 M
B. 0.96 M
C. 0.24 M
D. 0.024 M

Answer

C

Explanation

Milli mole of Hypo `=0.25xx48`
`=2xx` milli moles of `Cl_(2)`
milli mole of `Cl_(2)=(0.25xx48)/2=6` milli mole of `CaOCl_(2)`
= milli mole of `Cl_(2)=` milli mole of `CaOCl_(2)`
So, molarity `=6/25 M=0.24 M`.