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A sample containing HAsO(2) (mol. Mass=1...

A sample containing `HAsO_(2)` (mol. Mass=108) and weighing 3.78 g is dissolved and diluted to 250 mL in a volumetric flask. A 50 mL sample (aliquot) is withdrawn with a pipet and titrated with 35 mL of 0.05 M solution of `I_(2)`. Calculate the percentage `HAsO_(2)` in the sample :

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