Grade 12th passPhysical Chemistry
Why the equivalent weight & molecular weight of sodiun thiosulphate is same ?
Why the equivalent weight & molecular weight of sodiun thiosulphate is same ?
1 Answer
Arun
The equivalent weight is the gram molecular weight divided by the number of electrons lost or gained by each molecule;
e.g.,potassium permanganate (KMnO4) in acid solution, 158.038/5 g; potassium dichromate (K2Cr2O7), 294.192/6 g; and sodium thiosulfate (Na2S2O3·5H2O), 248.1828/1 g. In case of Sodium Thiosulfate the reation proceeds as under: I2 + 2 Na2S2O3 → Na2S4O6 + 2 NaI 2 Na2S2O3 ≡ I2 ≡ Cl2 ≡ 2 e Hence Na2S2O3 ≡ 1 e Thus Molecular weight devded by 1 is the equivalent weight & hence both have same value
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