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Sodium Thiosulfate and Hydrochloric Acid at Different Concentration of Hydrochloric Acid Essay Preview: Sodium Thiosulfate and Hydrochloric Acid at Different Concentration of Hydrochloric Acid Report this essay Purpose The purpose of this lab is to compare the reaction between sodium thiosulfate and hydrochloric acid at different concentration of Hydrochloric acid. Variables Independent variable : different.