What are the advantages of the gas syringe method and the upside down burette method?
What are the advanatges of them, and disadvantages?
For determination of the amount of carbon dioxide produced, I would prefer the gas syringe method instead of the upside down burette method (water displacement). One of the problems with using the upside down burette method with CO2 is the potential mixing of some of the CO2 into water (which is present inside the upturned burette). This would result in erroneous measurements of the quantity of carbon dioxide generated. This would not be an issue when using the gas syringe method, where the carbon dioxide will not mix with the liquid in the flask. The upside down burette method also suffers from errors due to the difference in the densities of carbon dioxide and water vapors. Gas syringes, though slightly expensive, are leak-proof and (if frictionless) will not pressurize the gases and thus will generate a much more accurate reading.