A solution of Na2S2O3 is standardized io...

A solution of `Na_2S_2O_3` is standardized iodometrically against `0.167g` of `KBrO_3`. This process requires `50mL` of the `Na_2 S_2O_3` solution. What is the normality of the `Na_2S_2O_3.` ?

0.2 N

0.12 N

0.72 N

0.02 N

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The correct Answer is:

`overset(2+)(Na_2S_2O_3)+overset(+5)(KBrO_3)toBr^(-) +overset(+2.5)(Na_2S_4O_6)`
`v.f=1 " " v.f=6`
by m.e. of `Na_2S_2O_3`=m.e. of `KBrO_3`
molarity of `Na_2S_2O_3=0.1` M

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