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Before the apparatus was set up the experiment had to planned as fairly as possible. This involved only changing one variable at a time, therefore all the other variables had to be kept constant. Firstly the mass of the chips was kept as similar as possible, I did this by weighing the chips to be at an approximate mass of 5.0g on a top pan balance. From a previous experiment I did involving different sized marble chips I found that the surface area greatly effects the rate of reaction, therefore the marble chips were separated by hand using a sieve to obtain pieces of medium size. Another variable I took into account was the volume of HCl will use, I chose to use exactly 20cm for each experiment. Also I intend to measure the initial temperature of the acid before the experiment with a thermometer. After deciding how to approach all...

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