A 2.5gsample containing As_(2) O_(5) Na_(2) HAsO_(3) and inert substance is dissolved in water and the pH is adjusted to neutralwith excessof NaHCO_(3). The solution is titrated with 0.15M I_(2) solution, requiring11.3 mL to just reach the end point, then the solutionis acidified with HCl, KI is added and the liberated iodine requires41.2 mL fo 0.015M Na_(2)S_(2)O_(3) under basic conditionswhere it converts to SO_(4)^(2-). Calculate per cent compositon of mixture.

A 2.5gsample containing As_(2) O_(5) Na_(2) HAsO_(3) and inert substan

1.	A 2.5gsample containing As_(2) O_(5) Na_(2) HAsO_(3) and inert substance is dissolved in water and the pH is adjusted to neutralwith excessof NaHCO_(3). The solution is titrated with 0.15M I_(2) solution, requiring11.3 mL to just reach the end point, then the solutionis acidified with HCl, KI is added and the liberated iodine requires41.2 mL fo 0.015M Na_(2)S_(2)O_(3) under basic conditionswhere it converts to SO_(4)^(2-). Calculate per cent compositon of mixture.
Answer» ANSWER :`Na_(2) HAsO_(3) = 11.53%, As_(2)O_(5) = 3.57%` inert MATERIAL `= 84.9%`