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Question

A solution of Na2S2O3 is standardized iodimetrically against 0.1262 g of KBrO3. This process requires 45ml of the Na2S2O3 solution. What is the molarity of the Na2S2O3?

A
0.2M
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B
0.01M
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C
0.05M
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D
0.1M
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Solution

The correct option is B 0.01M
The balanced chemical equation is as shown below:
8Na2S2O3+10KBrO3+7H2SO4Na2S4O6+5K2SO4+14NaHSO4+5Br2
The number of millimoles of KBrO3 present in 0.1262 g is 0.1267167×1000=0.7555.
The number of millimoles of Na2S2O3 required for the titration is 0.7555×810=0.6044.
The volume of Na2S2O3 solution is 45 ml.
The molarity of Na2S2O3 solution is 0.604445=0.0130.01M.

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