Hi, I have a doubt about making an equivalent %co2 solution with sodium carbonate. I have attached the reference equation quoted in the research article. If anyone knows how to derive the equation kindly help me.
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pH=6.30+log [ HCO3− ] −log [ CO2]
pH=10.09+log [ CO3 2- ] −log [ HCO3-]
The values of sodium carbonate concentrations corresponding to 5%, 10%, 15%, 20% and 30% CO2 concentrations at pH 7 are 1.3 g/L, 2.6 g/L, 3.8 g/L, 5.1 g/L, and 7.6 g/L, respectively.
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Hi.
I think you can find the answer in every hydrochemistry textbook, in the chapter on carbonate equilibrium. The point is that each addition of acid or base changes the proportions of H2CO3* (ie H2CO3 + CO2 . xH2O + CO2), HCO3- and CO32- in the solution.
Dalibor Matýsek Thanku for your response sir...I am facing difficulty in deriving the calculation...I kindly request you to help me in finding Na2CO3 concentration for 50% CO2 (v/v)..
Hi.
I don't understand what good it will do either. Anything can be calculated, but the reality for such a saturated solution will be completely different. These are the activities of the individual components. It is clear that in a solution containing Na2CO3 the pH will be >>10 and the carbon will only be in the form of CO32-.
I am a bit confused that you want to prepare a solution with a volumetric concentration (volume/volume). I didn't quite understand that.
Dalibor Matýsek Hi sir.....Thanks for your response...
Yes sir....like the same as i mentioned in my question as a reference...May be I wrongly understood (v/v) concept....But now I want to prepare 50% CO2 solution... I want to know how much Na2CO3 can be dissolved in water to get 50% co2 as equivalent...
I am attaching the reference article for your clarification sir...I kindly request you to refer the materials and methods part sir....
Kindly help me
In case you are concerned with the carbonic acid (H2CO3) / sodium bicarbonate (NaHCO3) buffer, you may possibly want to check the following discussion: https://www.researchgate.net/post/How_can_stabilise_the_pH_of_01M_sodium_bicarbonate_solution_made_in_the_lab_to_80
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