Question

In the reaction of sodium thiosulphate with $I_2$ in aqueous medium, the equivalent weight of sodium thiosulphate is equal to

• A. molar mass of sodium thiosulphate.
• B. the average of molar masses of $Na_2S_2O_3$ and $I_2$
• C. half the molar mass of sodium thiosulphate.
• D. molar mass of sodium thiosulphate $\times 2$

Answer 1

Answer: (A)

molar mass of sodium thiosulphate.

Answer 2

$2 Na _{2}\, \overset{+2}{S _{2}}\, O _{3}+ I _{2} \longrightarrow Na _{2}\,\overset{+2.5}{ S _{4}}\, O _{6}+2 NaI$
$n$-factor $=1$
$E=\frac{M}{1}=M$