GCSE Chemistry Required Practical: Concentration and Rate of Reaction
Contents
Key Stage 4
Meaning
Investigate how concentration affects the rate of reaction.
Method
Observation of Rate by Opacity
- Draw a large thick black cross on to a White Tile and place a 100ml Conical Flask on top as shown in the diagram.
- Measure 10ml of 0.25M Sodium Thiosulphate using a Measuring Cylinder and add to the Conical Flask.
- Measure 40ml of Water and add to the Conical Flask.
- Measure 10ml of 2M Hydrochloric Acid using a Measuring Cylinder.
- Add the 10ml of Hydrochloric Acid to the Conical Flask while starting a stopwatch.
- Observe the cross from above, through the solution. When the cross is no longer visible through the solution stop the stopwatch and record the time in seconds.
- Repeat the experiment with 20ml Sodium Thiosulphate and 30ml Water, 30ml Sodium Thiosulphate and 20ml Water, 40ml Sodium Thiosulphate and 10ml Water and 50ml Sodium Thiosulphate.
- Repeat the same experiment for all ratios of Sodium Thiosulphate and Water a further two times to calculate an average.
Observation of Rate by Gas Produced
This diagram shows a possible setup for measuring the gas given off during an experiment. |
- Set up the apparatus as shown in the diagram.
- Measure 10ml 2M Hydrochloric Acid using a Measuring Cylinder.
- Add the Hydrochloric Acid to the Boiling Tube.
- Add 1 spatula of Marble chips Calcium Carbonate to the Boiling Tube.
- Attach the bung.
- Fill the 50ml Measuring Cylinder with water in the tub and hold it over the end of the delivery tube to collect the bubbles.
- Start a stopwatch and record the volume of gas in the Measuring Cylinder every 10 seconds.
- Repeat this experiment with 10ml 1M Hydrochloric Acid.