Regionales Rechenzentrum der Universität Hamburg/ MCC/ Lecture2Go
Lukas Rieder
Verlag/Körperschaft:
Universität Hamburg
Erscheinungsjahr:
2024
Medientyp:
Audiovisuell
Schlagworte:
TA
open carbonate system total alkalinity
DIC
pH
pCO2
temperature dependence
Geowissenschaften
Beschreibung:
00:00 Open carbonate system intro 02:00 partial pressure CO2 04:26 Henry's law 07:30 Dissociation constants carbonic acid 10:58 Ionic strength 12:25 Total alkalinity expression 17:00 pH calculation code example 20:30 pH of an alkaline solution in equilibrium with the atmosphere 21:30 pH of pure water in equilibrium with the atmosphere This video guides us through calculating the pH value of an aqueous solution in the open carbonate system (gas flux between atmosphere and water allowed. The total alkalinity of the water can be introduced into pure water by carbonates ( NaHCO3, Na2CO3, MgCO3) or Hydroxides (NaOH, Ca(OH)2, Mg(OH)2 ). There can be other forms of alkalinity in the seawater and organic-rich waters because other acid-base systems play a role in these waters. To make a simple, understandable video, I am neglecting the fugacity of the gas (assuming ideal gases). Furthermore, the temperature, pressure, and ionic strength dependence on the dissociation constants are neglected for simplicity. For more interested viewers, I recommend using my website and exploring more combinations of parameters. Try the website and test on your own with different data combinations: https://plankton-app-8qc2n.ondigitalocean.app/
