Furthermore the controlled variables volume of hydrochloric acid and the mass of marble chips were maintained throughout the experiment by using a funnel to pour the hydrochloric acid from a measuring cylinder to a conical flask to confirm there was no spillage and that the acid measured 30ml. Repeat the experiment with 20g of the same marble chip size and 20cm 3 of the acid made up to 40 using distilled water. Compare the slopes of the two graphs.
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