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Rates of reaction

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Question 53

Magnesium ribbon reacts with dilute sulfuric acid to produce magnesium sulfate solution and hydrogen gas.

A student wants to investigate the effect of the concentration of sulfuric acid on the rate of this reaction.

The student used the following method:

  • Step 1: Pour 50 cm3 of 0.5 mol/dm3 sulfuric acid into a conical flask.
  • Step 2: Ensure the acid is at a temperature of 25 ∘C25\text{ }^\circ\text{C}25 ∘C using a water bath.
  • Step 3: Add a 4 cm strip of magnesium ribbon to the acid.
  • Step 4: Immediately start a stopwatch.
  • Step 5: Measure the time taken for the magnesium ribbon to completely dissolve.
  • Step 6: Repeat steps 1–5 using 1.0 mol/dm3, 1.5 mol/dm3, and 2.0 mol/dm3 sulfuric acid.

The student kept the volume of sulfuric acid the same in each experiment.

State two other variables that should be kept the same.

[2]

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