experimental
- Created by: Jasmin
- Created on: 22-01-14 08:53
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- Experimental method to find enthalpy of combustion of a liquid
- Spirit burner containing the liquid is weighed
- To extrapolate graph
- Draw line through first 5 points and extend to at least 3 minutes
- Draw line from max temp to final temp and extrapolate backwards to before time when burner was lit
- Measure difference in heights between these two lines at teh time when heating started. Difference in triangle H
- Draw line from max temp to final temp and extrapolate backwards to before time when burner was lit
- Draw line through first 5 points and extend to at least 3 minutes
- Possible sources of error
- As the experiment takes a long time, not all the heat is lost to the surroundings is compensated for by the extrapolation of the graph
- Some of the heat released in burning heats up the air and not water
- Beaker absorbs some of the heat produced
- Incomplete combustion - soot at bottom
- Conditions are not standard
- Incomplete combustion - soot at bottom
- Beaker absorbs some of the heat produced
- Some of the heat released in burning heats up the air and not water
- As the experiment takes a long time, not all the heat is lost to the surroundings is compensated for by the extrapolation of the graph
- Diagram
- Calculating standard enthalpy changes of reaction formula that allows it to be calculated from data
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