Separate: Chemistry and Extended Only
A length of magnesium ribbon was added to 50 cm3 of sulfuric acid, concentration 1.0 mol/dm3. The time taken for the magnesium to react was measured. The experiment was repeated with the same volume of different acids. In all these experiments, the acid was in excess and the same length of magnesium ribbon was used.
Experiment | Acid | Concentration in mol/dm3 | Time / s |
A | sulfuric acid | 1.0 | 20 |
B | propanoic acid | 0.5 | 230 |
C | hydrochloric acid | 1.0 | 40 |
D | hydrochloric acid | 0.5 | 80 |
Suggest two changes to experiment C which would increase the speed of the reaction and explain why the speed would increase. The volume of the acid, the concentration of the acid and the mass of magnesium used were kept the same.
change 1 ....................................................................................................
explanation ................................................................................................
change 2 ....................................................................................................
explanation .................................................................................................
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