To investigate the effect of concentration on rate of reaction.

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To investigate the effect of concentration on rate of reaction.

Ca3(s) + 2HCl(aq) --> 2CaCl2(aq) + H20(l) + CO2(g)

AIM: I am going to take 2 grams of marble, all of similar sizes, and place them into different concentrations of hydrochloric acid. I will see what effect the different concentrations of acid has on the rate of reaction. I will measure the mass of the acid and mass of the marble chips. Using a stop watch every 30 seconds I will weigh the mass of the chips. The mass will decrease due to the reaction of the chips and acid to form carbon dioxide gas, the gas will escape from the beaker leaving the mass lower. I will work out the mass lost using the formula "original mass - mass after reaction = mass lost" I will repeat each experiment at least twice and then take an average of the two to make my results more accurate.

Using the formula "rate of reaction = mass/time" I will work out the rate of reaction.

I will then compare the different rates of reaction for the different concentrations. By plotting the results on graphs with the same scale