Chemistry of making carbonated water?
I've found guides online for making carbonated (soda) water at home using a CO2 tank, a regulator and a plastic bottle. The guides suggest using "ice cold" water, filling the bottle 1/2 to 2/3 full, but differ on how much to shake the bottle, how many times to refill the bottle and what pressure to fill the bottle to. I was wondering if someone could provide an explanation for what the effect of temperature, pressure and agitation plays on the carbonation process and what a best practice might be for making soda water at home on demand.
EDIT: A regulator tells you the pressure in the bottle--it doesn't tell you how much CO2 has entered the bottle. So my question is two parts: What's the "optimal" amount of CO2 per 1L H2O for a carbonated beverage and how do you tell when you've hit this amount? Say I have a 1L bottle filled with 0.5L H2O. At what pressure should the bottle be at 10°C for "optimum carbonation"?
Cheers
Best Answer
CO2 actually dissolves better in cold water vs hot water. that's why warm soda bottles will usually look more bubbly inside. Shaking the bottle greatly increases the surface area of interaction between water and gas, helping to speed up the process of carbonation.
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Answer 2
First you must understand what the regulator does. If you set it for 20 lbs/sq inch then as CO2 dissolves into the water the regulator will release more CO2 from the high pressure tank to keep the gas pressure at 20 lbs/sq. inch.
CO2 actually dissolves better in cold water vs hot water. This is an equilibrium condition.
More CO2 dissolves into the water as the pressure is increased. This is an equilibrium condition.
Shaking increases the surface area of the water so the CO2 will dissolved into the water faster. For a given temperature and pressure though only so much CO2 will dissolve into the water. Shaking the water won't make "more" CO2 dissolve into the water, it will only make the water/CO2 system come to equilibrium faster.
Answer 3
Only a partial answer - a gas is more soluble in cold water.
(solid is more soluble in hot liquid)
Please provide a link to one of the videos.
Video I saw he barely shook.
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