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. Place 40cm 3 of hydrochloric acid in an. To investigate the effect of concentration on the reaction between marble chips and hydrochloric acid.
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