What are the advantages of the gas syringe method and the upside down burette method?  Say you were collected results on how much carbon dioxide is being produced, and you could chose between...

What are the advantages of the gas syringe method and the upside down burette method? 

Say you were collected results on how much carbon dioxide is being produced, and you could chose between using the gas syringe method and the upside down burette method (water displacement), which would you chose and why? 
What are the advanatges of them, and disadvantages?

Asked on by jl341122

1 Answer | Add Yours

gsenviro's profile pic

gsenviro | College Teacher | (Level 1) Educator Emeritus

Posted on

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.

We’ve answered 318,976 questions. We can answer yours, too.

Ask a question