Investigating the Rate of Reaction Between Sodium Thiosulphate and Hydrochloric Acid

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Investigating the rate of reaction between Sodium Thiosulphate and Hydrochloric Acid

Aim: an experiment to find out how the rate of reaction changes with differing concentration of Sodium Thiosulphate (Na S O), Hydrochloric Acid (HCL) and water (H²O).

Prediction : I predict that the rate of reaction will increase (and get more cloudy, more quickly) when the solution of Sodium Thiosulphate and Hydrochloric Acid are strongest, and there is no water. The reason for this is that it will be easier for the Sodium Thiosulphate to react with the Hydrochloric Acid, as they are the only two chemicals in the beaker, and there is not water to hinder the rate of the reaction. There will also be more Sodium Thiosulphate to react with the Hydrochloric Acid, regardless of how much water there is.
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For a reaction to take place there has to be a collision with two different chemical particles. If the concentration of the hydrochloric acid was to be high the more acid particles there would be. The more acid particles there are the more likely of a collision to occur.

By adding to water to the hydrochloric acid would make the acid less concentrated, meaning there would be less acid particles and also a less likely of that a sodium thiosulphate would collide into acid particle.

Equipment :

Beakers,

Measuring cylinders

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