mass changes

bobbie212 · 5 Oct 2004, 12:49 AM

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how are the mass changes most acurately weighed in fermentation

mervvyn · 5 Oct 2004, 3:17 PM

Weigh the whole apparatus before you start the fermentation, keep in a place away from where too much evaporation will happen, then weigh it again afterwards, and most of the mass difference will be CO2 lost.

bobbie212 · 6 Oct 2004, 12:21 AM

the aparatus includes the beaker full of limewater, so ther will be no mass loss. would the best way to do it be weigh beaker of limewater before and after the fermentation, and also mabye weigh conical flask before and after and get an average mass loss of the 2?

mervvyn · 6 Oct 2004, 4:22 AM

no - because not all of the CO2 will react with the limewater or some of the CO2 will be atmospheric and not from the experiment. So you would weigh them separately before and after, the mass change of the limewater isn't a really accurate indicator.

5 Oct 2004, 12:49 AM	#1 (permalink)
bobbie212 Member Join Date: Sep 2004 Posts: 160 Last Activity: 5 Sep 2005, 7:14 PM	mass changes You can hide this advertisement by registering. how are the mass changes most acurately weighed in fermentation

5 Oct 2004, 3:17 PM	#2 (permalink)
mervvyn Marshm'ello HSC: 2004 Gender: Male Location: Somewhere over the rainbow... yes, that rainbow. Join Date: Aug 2004 Posts: 541 Last Activity: 9 Nov 2006, 1:50 PM	Weigh the whole apparatus before you start the fermentation, keep in a place away from where too much evaporation will happen, then weigh it again afterwards, and most of the mass difference will be CO2 lost. __________________ UNSW Med II '06 Tommeah!

6 Oct 2004, 4:22 AM	#4 (permalink)
mervvyn Marshm'ello HSC: 2004 Gender: Male Location: Somewhere over the rainbow... yes, that rainbow. Join Date: Aug 2004 Posts: 541 Last Activity: 9 Nov 2006, 1:50 PM	no - because not all of the CO2 will react with the limewater or some of the CO2 will be atmospheric and not from the experiment. So you would weigh them separately before and after, the mass change of the limewater isn't a really accurate indicator. __________________ UNSW Med II '06 Tommeah!

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6 Oct 2004, 12:21 AM	#3 (permalink)
bobbie212 Member Join Date: Sep 2004 Posts: 160 Last Activity: 5 Sep 2005, 7:14 PM	the aparatus includes the beaker full of limewater, so ther will be no mass loss. would the best way to do it be weigh beaker of limewater before and after the fermentation, and also mabye weigh conical flask before and after and get an average mass loss of the 2?