Question

A standard iodine solution was standardized against a 0.4123 g primary standard As2O3, requiring 40 mL of iodine solution. What is the normality of iodine solution? MW of As2O3= 197.84

Answer 1

Equivalent mas₁s= of I₂ used = V₁×N₁ =40×N₁

Mass of As₂O₃= 0.4123 g

Now,

Equivalent Mass of I₂ liberated = Equivalent mass of As₂O₃

40×N₁=$\frac{0.4123×4×1000}{197.84}$

N₁ = 0.208