29 In the reaction of sodium thiosulphate with I2 in aqueous medium the equivalent weight of sodium thiosulphate is equal to 1) Molar mass of sodium thiosulphate 2) the average of molar masses of Na2S2O3 and I2 3) half the molar mass of sodium thiosulphate 4) molar mass of sodium thiosulphate 2

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I_{2}

(N a_{2} S_{2} O_{3} \cdot 5 H_{2} O)

2 N a_{2} S_{2} O_{3} + I_{2} \to 2 N a I + N a_{2} S_{4} O_{6}

I_{2} + 2 N a_{2} S_{2} O_{3} \to 2 N a I + N a_{2} S_{4} O_{6}

The reaction of sodium thiosulphate with $I_{2}$ produces:

0.1 g K I O_{3}

K I

H C l

45 m L

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