How many grams of carbon dioxide for 2 liters of 40 degree water at 35 psi?

May 22, 2023 2 Replies
W

The calculations never troubled me before today because it just works.



But I'm suddenly tasked with manning the carbonation science booth for at the local neighborhood summer block party and I want to have at least some basic mathematical "science" behind me on the paperboard descriptions.



I'll be having the kids evacuate the air out of 2-1/2 liter soda bottles filled to only 2 liters of 40 degrees Fahrenheit water and then thety will carbonate to about 30 psi but I don't know how many grams of CO2 that is.



Where can I find that calculation given 100% partial pressure of CO2?


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B

1/2 liter of 30psi CO2 for 2 liters of H2O is not going to make very carbonated water, unless that 30psi is maintained for a significant time, like hours, unless broken into very fine bubbles as it is put into the bottles. For my corny kegs, I have to add CO2 many times over several days to get it properly carbonated, or I have to leave the CO2 tank valve open for hours. 1 liter at 30 psi is about 2 liters of CO2 at atmospheric pressure. Most of that pressure will go away by the time the CO2 is dissolved in the water.
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