Experiment

[mariatachejian]

Hi all,
I have a practical experiment requiring me to work with soda bottles and carbon dioxide and I need to figure out some measurements. I get more  info about it during the actual assessment tomorrow.
Does anyone have any advice about calculations regarding carbon dioxide and whether knowledge regarding equilibrium is necessary?
Thank you

[RuiAce]

To be honest - for this prac, there really isn't much for this particular prac.

The calculations are very standard mole calculations for this one. The equation is just \( H_2CO3_{(aq)} \leftrightharpoons H_2O_{(l)} + CO_2{(g)} \), so the mole ratio is just the simple 1:1:1 here.

However, they would very likely expect you to understand the role of LCP here. The instant you open the bottle you're pretty much reducing the pressure, which is why the equilibrium goes all the way to the right and all that CO2 comes out. (Also, formation of H2CO3 is exothermic, and thus the forward reaction above is endothermic. So you could think about the role of temperature here. But I'm not sure how important that is.)

[kaustubh.patel]

This is actually a good moment to revise what i did for the experiment. we measured the mass of the bottles first and opened it up and measured the new mass, then put it in hot water (50 degree) and timed the opened can for 10 mins and recorded the mass at the end. And at last we measured some cotton and put in on the opened hole of the can and let the can sit in the open for 3 days and then recorded the mass again and graphed the results. Obviously the prac exam wont make you make you wait 3 days, but it may ask for ways to improve the experimental design so I hope this helps.