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Planning: The determination of a rate equation Aim: Determine how the concentration or volume of each component affects the rate equation of the reaction between sodium thiosulphate Na2S2O3(aq) and hydrochloric acid HCl(aq), using a graphical method. Theory: The rate of a reaction can be expressed in terms of the rate of decrease in concentration of a reactant or the rate of increase in concentration of a product. It is affected by the following factors: concentration of reactants, pressure, temperature, physical state of reactants and catalysts. The most common method used to calculate the rate of reaction is to measure the change in concentration of the reactant(s) per second. The rate of a reaction may be represented by a mathematical equation related to the chemical equation for a reaction. Rate equation has the form rate = k [A] x [B] y which shows how the rate of a chemical reaction depends on the concentration of reactants (A and...

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