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Rates of Reaction Sodium Thiosulphate and Hydrochloric acid Increasing the concentration (in solution). Increasing the concentration of a substance in solution means that there will be more particles per dm3 of that substance. The more particles that there are, the more will collide per second, and so the rate of the reaction increases. In the reaction between sodium thiosulphate solution and dilute hydrochloric acid, HCl+sodium thiosulphate sodium chloride+sulphur dioxide+sulphur+water.
