We will carry out an experiment to see how concentration affects rate of reaction between Sodium Thiosulphate and Hydrochloric Acid.

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Rates of reaction coursework

Introduction

We will carry out an experiment to see how concentration affects rate of reaction between Sodium Thiosulphate and Hydrochloric Acid. The equation for the reaction is=

S2O3(aq) + 2H(aq) S(s) + H2O(l) + SO2(g)

In order for a reactant to be broken down, the chemical bonds that hold the atoms together have to be broken by other particles bumping into them. The energy needed for this to happen alters from chemical to chemical, and this is called the ACTIVATION ENERGY. Increasing the temperature gives the particles more energy, and this makes them more capable of travelling faster and bumping into the bonds with more energy and breaking more, therefore breaking down the substance. Increasing the concentration of the substance also makes the reaction happen quicker, as this means that there are more particles, and in turn this means that more particles can react and more of the substances is broken down. Surface area also affects the rate of reaction. If the surface area is larger, then there are more particles exposed for reaction.

The rate of reaction is the amount of time it takes for the