# State Your Observations When Dilute Hydrochloric Acid is Added to Sodium Thiosulphate - Chemistry

State your observations when Dilute Hydrochloric acid is added to Sodium thiosulphate.

#### Solution

Dil. HCl reacts with thiosulphates to produce sulphur dioxide and yellow sulphur is precipitated.

Na2S2O3 + 2HCl → 2NaCl + H2O + SO2 + S ↓

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