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Question

Why does sulphur dioxide gas evolved when HCl gas is added to Sodium thiosulfate?


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Solution

Reaction of Hydrochloric acid and Sodium thiosulfate:-

  • When Hydrochloric acid is treated with Sodium thiosulfate(Na2S2O3), Sodium chloride, Sulphur dioxide, water, and sulphur are formed as its product.
  • The complete reaction is:

Na2S2O3(aq)Sodiumthiosulphate+2HCl(aq)Hydrochloricacid2NaCl(aq)Sodiumchloride+H2O(l)Water+SO2(g)Sulphurdioxide+S(s)Sulphur

  • Here we can see that Sulphur dioxide gas is being evolved.
  • This is because Sulphur is a non-metal and it does not react with acids.
  • Also sulphur is less reactive when compared to hydrogen.
  • As a result, the hydrogen is not displaced by the sulphur atom from Hydrochloric acid.
  • This is the reason why Sulphur dioxide gas evolved when HCl gas is added to Sodium thiosulfate(Na2S2O3).

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