To Decarbonate Soft drink... (1 Viewer)

[Calculon]

whats all this shit about heating it, why wouldn't you just freeze it, that way all the CO2 comes out, and no water evapourates

 

[Xayma]

Will the CO2 come out? There will always be bubbles formed in the ice.

 

[Calculon]

Nah cos it cant dissolve in a solid

 

[Xayma]

It wont dissolve but as some of it comes out of solution the water above may already be frozen resulting in it being trapped and also weighed. And you might break the can/bottle due to the expansion of water.

 

[Calculon]

Originally posted by Xayma
It wont dissolve but as some of it comes out of solution the water above may already be frozen resulting in it being trapped and also weighed. And you might break the can/bottle due to the expansion of water.

thats why you tip a bit out

 

[Xayma]

Originally posted by Calculon
thats why you tip a bit out

But the gas isnt distributed evenly among the liquid by pouring a bit out you may tip out a lower % bit and get influenced results.

 

[xiao1985]

lolz, freezin.. uhm good one, neva thought abt it... =p blehz...

if the soln is cooled slowly then the bubbles trapped in the solid ice will be minimised...

 

[Calculon]

and plus once you thawed it all the bubbles would come out of the ice, with only an amount proportional to how much CO₂ is in the atmosphere would redissolve (about .03% i think)

 

[Xayma]

Good point, didnt think about thawing it. The amount redissolved will be equal to the controls so no noticeable effect will be noticied.

 

[blam_babe]

We just weighed a bottle of soda water with an empty PET bottle on the scale as well, then opened the bottle carefully, transerred the liquid to the PET bottle and shook it up, left it for a few days and then reweighed it.
Easy, simple, clear.

 

[Calculon]

I think I'm probably just overcomplicating a simple experiment in the interest of accuracy

 

[Marie-Paule]

we just weighed different bottles of soft drinks, then shook it n weighed it n kept doing that shakin takin the lid off carefully as not to lose any liquid n then we put it in a beaker of hot water. Left it over a weekend n reweighed it then calculate the amount of CO2 in it....

 

[kalinda]

do u really get all the co2 out if u are just shaking it

 

[xiao1985]

Originally posted by kalinda
do u really get all the co2 out if u are just shaking it

nah...

co2(g) + h2o(l) <---> h2co3 (aq)

is really in an equilibrium... even if there is no initial h2co3 in the soln, co2 will be dissolved slowly...