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The hydrochloric acid, Sodium thiosulphate reaction Research: "Hydrochloric acid is a strong colourless acid formed when hydrogen chloride gas dissociates in water, used in industrial and laboratory processes. Hydrochloric acid is also produced in the stomach, where it initialises the digestion of proteins. Sodium thiosulphate is a white crystalline salt used as a fixer in photography and as a bleach." Encarta World English Dictionary When hydrochloric acid reacts with sodium thiosulphate, sulphur is created. Sulphur is a pale yellow colour; after the reaction the sulphur stays in the same container as the other products, meaning that the solution will be a pale yellow colour. Na2S2O3 + H+ + Cl- 2NaCl + S + SO2 + H2O Sodium thiosulphate solution Hydrochloric acid Sodium chloride solution Sulphur Sulphur dioxide Water "The sulphur does not start to form immediately, but begins to appear after a short time, turning the mixture cloudy. You cannot tell precisely when the reaction has stopped." AQA GCSE Higher Sulphur dioxide (SO2) is a...

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