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Q.

One gram of Na3AsO4 is boiled with excess of solid Kl in presence of strong HCl. The iodine evolved is absorbed in Kl solution and titrated against 0.2 N hyposolution.Assuming the reaction to beAsO43−+2H++2I−⟶AsO33−+H2O+I2calculate the volume of thiosulphate hypo consumed.[Atomic weight of As = 75]

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a

48.1

b

38.4 mL

c

24.7 mL

d

30.3 mL

answer is A.

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Detailed Solution

molar mass Na3AsO4=23×3+75+16×4=208  eq. of AsO4−3=12082=1104 equivalent of Na3AsO4= equivalent of I2= equivalent of Na2S2O3 1104×.2L=1000104x0.2ml=48.0769ml
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One gram of Na3AsO4 is boiled with excess of solid Kl in presence of strong HCl. The iodine evolved is absorbed in Kl solution and titrated against 0.2 N hyposolution.Assuming the reaction to beAsO43−+2H++2I−⟶AsO33−+H2O+I2calculate the volume of thiosulphate hypo consumed.[Atomic weight of As = 75]