Practical investigations
Read our general notes on Risk Assessment
I am doing the iodine clock investigation with peroxydisulphate(VI) ions. How do I turn my answer for the activation enthalpy into the curve on the graph with enthalpy on the y axis and progress on the x axis if you know what I mean?
The two key values are the overall enthalpy change for the reaction and the activation energy. These give you the key points relative to the vertical y-axis.
The horizontal axis is essentially arbitrary. You have no way of putting a scale on the x-axis and plotting points relative to that scale. It is the y-axis that matters.
Risk assessment
Before attempting any practical work based on the advice and suggestions on this website, you must do the following. Identify any hazards, assess the risks from these hazards, and then decide appropriate control measures to reduce the risks. You must have these approved by those in authority in your school or college laboratory. Do not rely on what is said on this website.
For further guidance see our tutorial on Risk Assessment.
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updated: 04 April 2005
