1.
Bleaching powder and bleach solution are produced on a large scale and used in several household products. The effectiveness of bleach solution is often measured by iodometry.

2525 mL of household solution was mixed with 3030 mL of 0.500.50 M KI and 1010 mL of 44 N acetic acid. In the titration of the liberated iodine, 4848 mL of 0.250.25 N Na2S2O3\text{Na}_2\text{S}_2\text{O}_3 was used to reach the end point. The molarity of the household bleach solution is