A sample containing HAsO2 (mol. mass =18...

A sample containing `HAsO_2` (mol. mass `=180`) and weighing `3.78g` is dissolved and diluted to `250mL` in a volumetric flask. `A 50mL` sample (aliquat) is withdrawn with a pipet and titrated with `35mL` of `0.05 M` solution of `I_2`. Calculate the percentage `HAsO_2` in the sample :

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