How do I determine the proper ratio of CO2 and N for my tank?

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SUMMARY

To achieve a 25% CO2 and 75% N ratio in a 60 cf tank, the user must provide a specific "Recipe" to their supplier detailing the amount of liquid CO2 in pounds to be filled first, followed by the nitrogen (N) to complete the blend. The discussion raises important questions about whether the ratio should be calculated based on mass or moles, and it emphasizes the need to clarify the initial contents of the tank and the method for removing them if necessary.

PREREQUISITES
  • Understanding of gas mixtures and ratios
  • Knowledge of tank volume measurements (cubic feet)
  • Familiarity with liquid CO2 properties and handling
  • Basic principles of gas laws and pressure calculations
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  • Research the properties and handling procedures for liquid CO2
  • Learn about gas mixture calculations and the significance of mass vs. mole ratios
  • Investigate methods for measuring and adjusting gas volumes in tanks
  • Explore safety protocols for working with high-pressure gas tanks
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Aquarium enthusiasts, gas supply technicians, and anyone involved in gas blending for industrial or laboratory applications will benefit from this discussion.

Jlat
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I wish to fill a 60 cf tank with both CO2 and N at a 25% - 75% ratio. I have been told by my supplier that if I can tell them the "Recipe" for my size tank that they could make this happen for me.
What I need to know is the amount of liquid CO2 (measured in pounds) that would be placed into the tank first and then the amount of N that would then be put 'on top' to reach my desired blend.

Thanks,
 
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Hello Jl,

Would that be a mass ratio or a mole ratio ?
What's in the tank initially ? How do you get it out ?
 

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