Q48) What is the n-factor of thiosulphate ion when it is converted into sulphate ion?
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The n-factor of thiosulphate ion when it is converted into sulphate ion will be 8.
Chemical equation for conversion of thiosulphate to sulphate:
Na₂S₂O₃ + 4Cl₂ + 5H₂O = 2NaHSO₄ + 8HCl
(thiosulphate) (chlorine) (water) (sulphate) (hydrochloride)
The oxidation state of sulphur in thiosulphate is +2
The oxidation state of sulphur in sulphate is +6
Hence, there is a change of 4 electrons.
But two atoms of sulphur are involved in thiosulphate,
Therefore, 4 × 2 = 8 electrons.
The number of electrons exchanged will be the n-factor which is 8.
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