Quantative practical help
Practical is on determining the enthalpy change of a reaction, reacting things together in a polystyrene cup. Straight forward but I need advice on the following kinds of questions:
'Errors in measurement'
'Identify those errors that are significant and justify your choice'
'Suggest and justify improvements to the procedure'
(I am thinking things like bomb calorimeter that has better insulation ect)
'Suggest and justify improvements to the methods of taking measurements'
'Errors in measurement'
'Identify those errors that are significant and justify your choice'
'Suggest and justify improvements to the procedure'
(I am thinking things like bomb calorimeter that has better insulation ect)
'Suggest and justify improvements to the methods of taking measurements'
Errors:
Most glaringly obvious one is heat loss to the surroundings (i.e. to the atmosphere rather than the water of the the temperature is being measured) if the reaction is exothermic.
The reaction may not have a very large temperature change so the thermometer you use may not be precise enough.
You may not have transferred all of the reactants to the polystyrene cup (particularly if on reactant is a powder).
Improvements
If you're sticking with the cup use a lid, use a better insulator for the cup material etc.
Bomb calorimeter would be a very good solution.
Improvements to method
Use an electric thermometer for more accurate measurements of temperature is all that really comes to mind, sorry
Hope this was of help!
Most glaringly obvious one is heat loss to the surroundings (i.e. to the atmosphere rather than the water of the the temperature is being measured) if the reaction is exothermic.
The reaction may not have a very large temperature change so the thermometer you use may not be precise enough.
You may not have transferred all of the reactants to the polystyrene cup (particularly if on reactant is a powder).
Improvements
If you're sticking with the cup use a lid, use a better insulator for the cup material etc.
Bomb calorimeter would be a very good solution.
Improvements to method
Use an electric thermometer for more accurate measurements of temperature is all that really comes to mind, sorry
Hope this was of help!
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