3) Planning - Finding the order of a chemical reaction.
* State appropriate volume of gas - 20-25cm
* Use this volume to calculate the second calculation, in this case the volume of solution needed for dilution.
Apparatus:
* Appropriate container for reaction - any vessel with a gas outlet and a stopper
* Appropriate collection of gas - over water or by syringe
* Apparatus for measuring volume of solution - measuring cylinder, pipette, buerette etc
* Thermostatic control - waterbath
Method:
* measure out specified volume of solution
* Keep mixtures at 20 degrees
* Take volume readings at suitable time interviews (or measure time taken to collect specific volume of gas).
* Experiment with at leats 2 concentrations of gas
Results
* Mesasure volumes at regular untervals
* plot senisble graph of results of volume vs time
* Clear and correct explaination of rate from graph
* clear correct explanation of use of rate data to establish first order
Hazards
* Phenol = toxic/corrosiv = wash spillages with cold water
* Eye protection.
* Pipette filler
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