Unit 2 Learning Aim C Part 3and 4
Unit 2 learning Aim C - How fast is your reaction? – Part 3
Safety
Wear eye protection while doing the practical work and keep it on when clearing up and washing things out in the sink.
Avoid skin contact with all the solutions used and wash off any splashes on your skin with cold running water.
Apparatus required eye protection timer 2 measuring cylinders (100 cm3) pipette paper with a black cross on it
Chemicals required sodium thiosulfate solution (15 g/dm3) cobalt(II) chloride solution (0.1 mol) iron(III) nitrate solution (0.1 mol) copper(II) sulfate solution (0.1 mol) iron(II) sulfate solution (0.1 mol)
What to do
1 Draw a cross on a piece of paper and put it underneath a 100 cm3 measuring cylinder, or use the cross from part 2, so it can be seen when looking down the cylinder.
2 Pour 50 cm3 of sodium thiosulfate solution into the measuring cylinder.
3 Pour 50 cm3 of iron(iii) nitrate solution in the second measuring cylinder.
4 Carefully pour the iron(iii) nitrate solution into the sodium thiosulfate solution and start the timer.
5 Look through the reaction mixture from above until the cross can first be seen –stop the timer and record the time. This is the time using no catalyst.
6 Repeat this experiment but add one drop of catalyst to the sodium thiosulfate solution before mixing. Test the various catalysts and complete the table.
Results for part 3
No catalyst
Copper(ii) sulfate
Iron(ii) sulfate
Cobalt(ii) chloride
Time (s)
Analysis and conclusion
1 What factor/variable were you investigating in this experiment?
2 What can you conclude about a substance that makes a chemical reaction go faster for this chemical reaction?
3 Describe how the presence of substances in the table above: copper(II) sulfate, iron(II) sulfate and cobalt(II) chloride) change rate of the reaction.
Unit 2 learning Aim C – How fast is your reaction? – Part 4
Chemical equation calcium carbonate + hydrochloric acid calcium chloride + carbon dioxide + water
CaCO3(s)
Safety
Wear eye protection while doing the practical work and keep it on when clearing up and washing things out in the sink.
Avoid skin contact with all the solutions used and wash off any splashes on your skin with cold running water.
Apparatus required eye protection timer 2 measuring cylinders (100 cm3) pipette paper with a black cross on it
Chemicals required sodium thiosulfate solution (15 g/dm3) cobalt(II) chloride solution (0.1 mol) iron(III) nitrate solution (0.1 mol) copper(II) sulfate solution (0.1 mol) iron(II) sulfate solution (0.1 mol)
What to do
1 Draw a cross on a piece of paper and put it underneath a 100 cm3 measuring cylinder, or use the cross from part 2, so it can be seen when looking down the cylinder.
2 Pour 50 cm3 of sodium thiosulfate solution into the measuring cylinder.
3 Pour 50 cm3 of iron(iii) nitrate solution in the second measuring cylinder.
4 Carefully pour the iron(iii) nitrate solution into the sodium thiosulfate solution and start the timer.
5 Look through the reaction mixture from above until the cross can first be seen –stop the timer and record the time. This is the time using no catalyst.
6 Repeat this experiment but add one drop of catalyst to the sodium thiosulfate solution before mixing. Test the various catalysts and complete the table.
Results for part 3
No catalyst
Copper(ii) sulfate
Iron(ii) sulfate
Cobalt(ii) chloride
Time (s)
Analysis and conclusion
1 What factor/variable were you investigating in this experiment?
2 What can you conclude about a substance that makes a chemical reaction go faster for this chemical reaction?
3 Describe how the presence of substances in the table above: copper(II) sulfate, iron(II) sulfate and cobalt(II) chloride) change rate of the reaction.
Unit 2 learning Aim C – How fast is your reaction? – Part 4
Chemical equation calcium carbonate + hydrochloric acid calcium chloride + carbon dioxide + water
CaCO3(s)