Hydrochloric acid to react with the marble chips independent variable marble chips to react with the acid dependent variable stopwatch to accurately time the experiment spatula to handle the marble chips measuring cylinder to precisely measure out different concentrations of hydryochloric acid electric balance to measure the mass g of the marble chips bung. Using the apparatus shown the change in mass of carbon dioxide can be measure with time. Investigating the rate of reaction between marble chips calcium carbonate and hydrochloric acid aim.
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