How does the concentration of Sodium Thiosulphate solution affect the rate of its reaction with Hydrochloric acid?

... How does the concentration of Sodium Thiosulphate solution affect the rate of its reaction with Hydrochloric acid? Prediction I predict that the higher the concentration of Sodium Thiosulphate solution the quicker the rate of reaction with Hydrochloric acid will be. I think this because the collision theory says that a higher concentration means a larger number of particles in a given volume. If there are more particles, there will be more collisions. More collisions mean a larger number of successful collisions. Therefore the reaction rate will increase. low concentration high concentration Fair test To make my experiment a fair test I will keep the following variables the same: * The temperature of the Sodium Thiosulphate * The total volume of all the liquids when added together * The amount of Hydrochloric acid * The same cross * Always measure the level of liquid at the meniscus * Use the same person to measure out

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