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Topic: impact of CO2 in alkalinity  (Read 1384 times)

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Offline science

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impact of CO2 in alkalinity
« on: April 14, 2014, 06:01:47 AM »
Hello!!!!

I have a question regarding the impact on alkalinity of dissolving CO2. I understand that in principle CO2 should not affect total alkalinity since it releases it forms the same amount of molar equivalents from protnons (H+) and carbonate species (CO32- and HCO3-). however, if I have a high concentration of Ca2+ in my media and of ammonia in the form of ammonia and ammonium.... is there a chance that injecting CO2 could precipiate or dissolve some carbonated precipitated that will have an impact on alkalinity?

thanks

Offline Borek

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Re: impact of CO2 in alkalinity
« Reply #1 on: April 14, 2014, 07:13:31 AM »
As far as I remember, alkalinity is a measure of how much acid solution can absorb before reaching a predefined pH. When you dissolve CO2 you technically add an acid, so the alkalinity should go down.
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