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Concentration of acid Vs. rate of reaction of sodium thiosulphate and hydrochloric acid? PLANNING: Introduction: The rate of a reaction is defined as the speed at which the reaction takes place. Many things can affect the rate of reaction. In this coursework I am investigating what effect the change in acid concentration will have on the rate of reaction. I have to make sure that this test will be fair. To do this I will keep all the variables constant other than the concentration of acid. The following variables will be kept constant: The type of acid, the equipment used, the mass of the marble chips, the size of the marble chips and the temperature. I will change the concentration of the acid weakening the solution using water. We will start off with pure acid and add more and more water as we go along. The total volume of the solution will be constant, at...

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