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There are two types of iodine titrations...

There are two types of iodine titrations (a) Iodometric & (b) Iodimetric, Iodometric method is indirect method of `I_(2)` estimation. Any oxidant which liberates `I_(2)` from KI solution, the liberated iodine is estimated by titrating it with `Na_(2)S_(2)O_(3)` solution as : `I_(2)+2Na_(2)S_(2)O_(3)rarr2NaI+Na_(2)S_(4)O_(6)`
100 mL of .x. M `K_(2)Cr_(2)O_(7)` solution is added to excess of KI solution in acidic medium. The liberated iodine required 50 mL of 0.1N `Na_(2)S_(2)O_(3)` solution. The value of x is

A

`21.58%`

B

`41.58%`

C

`51.58%`

D

`61.58%`

Text Solution

Verified by Experts

The correct Answer is:
B
eq. `CuSO_(4).5H_(2)O` = eq. `I_(2)` = eq. `Na_(2)S_(2)O_(3)`
`Pxx(3)/(249.5)xx1=(10)/(1000)xx0.5xx1=0.4158`
implies % Purity = 41.58%
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