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I am investigating the rate of reaction between hydrochloric acid and sodium thiosulphate. The variable I am going to change will be the temperature; I will raise the temperature by approximately 10oc each time. Other possible variables that could be changed are; changing the concentration of the acid, increasing the pressure by reducing the volume of the container which means the particles will be closer together which would result in faster collisions. Using a catalyst would speed up a reaction and changing the surface area could speed up or slow down the reaction. When the two chemicals are added together, they start to react. It will give off sulphur as one of the products. This is called a precipitation reaction. The equation between sodium thiosulphate and hydrochloric acid is: Na2 S2 O3(aq) + 2HCl(aq) 2NaCl(aq) + S(s) + SO2(g) A chemical reaction can only occur between particles when they collide. The faster...

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