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. Measured out 1ml of water in a 10ml measuring cylinder and placed into the test tube labelled 2. The rate of this reaction can be changed by changing the size of the marble chips.
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