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. In this reaction it is expected that as marble chips are in the solid form and their concentration does not change the rate will only depend upon the concentration of hydrochloric acid and is likely to be first order with respect to hcl. The mass of the marble chips in each test tube. 
				
			
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