A solution of `Na_(2)S_(2)O_(3)` is standardized iodometrically against 0.1262 g of `KBrO_(3)`. This process required 45 mL of the `Na_(2)S_(2)O_(3)` solution. What is the strength of the `Na_(2)S_(2)O_(3)`? (K = 39, Br = 80)

Options

A. `0.2M`
B. `0.1M`
C. `0.05M`
D. `0.1N`

Answer

B

Explanation

M.eq. `Na_(2)S_(2)O_(3)` = M.eq `I_(2)`
`45xxMxx1=nxx2impliesn=(45M)/(2)...(1)`
M.eq `I_(2)` = M.eq `KBrO_(3)`
`nxx2=6xx(0.1262)/(167)xx1000`
`impliesn=(3xx0.1262xx1000)/(167)...(2)`
From (1) & (2), `(45M)/(2)=(126.2xx3)/(167)impliesM=0.1`