Concentration and rate: practical using gas collection method
I can carry out a fair test to investigate how the rate of reaction depends on the concentration of a reacting solution.
Concentration and rate: practical using gas collection method
I can carry out a fair test to investigate how the rate of reaction depends on the concentration of a reacting solution.
These resources will be removed by end of Summer Term 2025.
Lesson details
Key learning points
- The changing rate of a reaction can be found by measuring the amount of gas produced as the reaction progresses.
- Increasing concentration of a reacting solution introduces more reactant particles, so they collide more frequently.
- When reacting excess acid with equal amounts of magnesium, the same volume is produced for all concentrations of acid.
Keywords
Rate of reaction - Rate of reaction is the speed with which a chemical reaction takes place.
Independent variable - The independent variable is the single variable that is changed in an investigation.
Dependent variable - The dependent variable is the single variable that is measured or observed in an investigation.
Control variables - The control variables are variables that are kept constant in an investigation.
Common misconception
Thinking that as the concentration of a solution in excess changes, so does the volume of gas produced.
The slide deck uses graphical data to show that the same volume of gas is produced when different concentrations are used, so long as the reacting solution is in excess.
Equipment
Conical flask, bung and delivery tube, water trough, measuring cylinder, timer, magnesium strips, different concentrations of hydrochloric acid and eye protection.
Content guidance
- Risk assessment required - equipment
Supervision
Adult supervision required
Licence
This content is © Oak National Academy Limited (2024), licensed on Open Government Licence version 3.0 except where otherwise stated. See Oak's terms & conditions (Collection 2).
Lesson video
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