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I am investigating the rate of reaction between marble chips (calcium carbonate) and hydrochloric acid. To find out about this, I am going to keep all other variables constant except the concentration of the hydrochloric acid. The equation of this reaction is: CaCO3 + 2HCl › CaCl2 + Co2 + H2O Calcium carbonate + hydrochloric acid › Calcium chloride+ Carbon dioxide + Water. I predict that the higher the concentration of the acid, the faster the rate of reaction is between the calcium carbonate and hydrochloric acid, in other words, the rate of reaction is directly proportional to concentration of acid. My graph of results will probably look something like this: This prediction can be supported by the theory that acid concentration is the amount of acid particles in a given volume. A higher acid concentration means that there are more acid particles in a given volume. Given that there are more acid particles...

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