Na2S2O3.5H2O equivalent mass in Na2S2O3 in the reaction is 2Na2S2O3+ I2gives Na2S4O6 + 2Na reactuonI

Na2S2O3.5H2O equivalent mass in Na2S2O3 in the reaction is 2Na2S2O3+ I

1.	Na2S2O3.5H2O equivalent mass in Na2S2O3 in the reaction is 2Na2S2O3+ I2gives Na2S4O6 + 2Na reactuonI
Answer» The equivalent weight of oxidising or reducing agent is = molecular weight / NUMBER of electron PER MOLE transfer during the REACTION. In above MENTIONED reaction there is transfer of 2 electrons per 2 moles of Na2S2O3 as follows : 2S2O32- → S4O62- + 2e- So the equivalent weight of Na2S2O3 is same as molecular weight = 158.11 g mol-1