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Question

Sodium thiosulphate could be synthesized by


A

boiling aqueous NaOH with Sulphur

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B

heating a solution of a Sodium sulphite with finely powdered S in an alkaline medium

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C

Spring’s reaction

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D

All of the above

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Solution

The correct option is D

All of the above


Na2S2O3 could be prepared by heating a solution of a Sodium sulphite with finely powdered S in an alkaline medium at 330 K:

Na2SO3(aq)+S(s)Na2S2O3(aq)

When aqueous NaOH is boiled with Sulphur:

6NaOH(aq)+4S(s)Na2S2O3(aq)+2Na2S(aq)+3H2O(I)

Spring’s reaction: When a measured amount of I2 is added to a mixture of Sodium Sulphide and Sodium Sulphite, we obtain hypo. Sodium thiosulphate pentahydrate, commonly called “hypo,” can easily be prepared by boiling sulphur in a solution of sodium sulphite:

Na2SO3+Na2S+I2Na2S2O3


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