Concnetraion Hydorchloric Acid

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How does changing the Concentration of Hydrochloric Acid Affect the Rate of Reaction between Hydrochloric Acid and Magnesium?

Dependent Variable

Volume of Hydrogen Produced – the volume of hydrogen produced in cm3 will be affected by the independent variable which in this case is the concentration of the hydrochloric acid. There is no way in which the volume of hydrogen produced can be controlled however make sure none is lost by making sure that the gas syringe is correctly connected. Measurements will be taken every 30 seconds for the volume of hydrogen produced for 5 minutes.

Independent Variable

Concentration – the variable which will be controlled is the concentration of the hydrochloric acid. The concentrations which will be used are 2M, 1.8M, 1.6M, 1.4M, 1.2M, 1.0M, 0.8M, 0.6M, 0.4M and 0.2M. The concentrations will be changed by using different measurements of hydrochloric acid and water.

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Controlled Variable

The equation for the reaction can be seen below;

Mg(s) + 2HCl(aq) → MgCl2(aq) + H2(g)

I will be controlling many of the variable which affect the volume of hydrogen which is produced.


Temperature – The temperature will be controlled because if the temperature was to be changed this could affect the dependent variable. To control this the experiment shall be done in the same lab with no heating and no cooling will be done while the temperature will also be maintained using a thermometer.

Volume – In this investigation the volume of the hydrochloric acid ...

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