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  4. In the reaction of sodium thiosulphate with I2 in aqueous medium the equivalent weight of sodium thiosulphate is equal to

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

Redox Reactions

Solution:

Since $2S_2O^{2-}_3 \rightarrow S_4 O^{2-} _6 + 2e^{-} $ is a $2 \, e^{-}$ change, therefore, Eq. mass of $Na_2S_2O_3 = 2 \times $ Mol. mass of $Na_2S_2C_3/2 =$ Mol. mass of $Na_2S_2O_3$.