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. The essay on hydrochloric acid and marble reactions. Measured 5ml of hydrochloric acid in the 10ml measuring cylinders and placed into each beaker separately.
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