A solution of Na 2 S 2 O 3 is standardized iodometrically against 0.1262 g of KBrO 3 where BrO 3 − changes to Br − . This process requires 45 mL of the Na 2 S 2 O 3 solution. What is t

Question

A solution of Na 2 ​ S 2 ​ O 3 ​ is standardized iodometrically against 0.1262 g of KBrO 3 ​ where BrO 3 ​ − changes to Br − . This process requires 45 mL of the Na 2 ​ S 2 ​ O 3 ​ solution. What is the molarity of the Na 2 ​ S 2 ​ O 3 ​ ? [M.w of KBrO 3 ​ = 167 ]

TestHub · Accepted Answer

Question Explanation:

The question asks about the molarity of $Na_{2} S_{2} O_{3}$ .

Concept:

This question is based on iodometric titration.

Solution:

Eq. of $Na_{2} S_{2} O_{3} \Rightarrow$ Eq. of $KBrO_{3}$

$N \times 45 = \frac{0.1262}{167} \times 6 \times 1000$

$N = 0.1$

$M = \frac{N}{n - f a c t or} = 0.1 M$

Final Answer: The correct option is (B).

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