Prow
I see where you are going but it is not all in the same direction
Not the I'm perfect
tanks with lower alk and high pCO2 levels have a lower saturation state comapred to tanks with high alk and the same pCO2 level, in regaurds to aragonite.
I agree.
At a reading of 7.8 a higher alk will increase the pCO2 saturation state.
Not sure what "pCO2 saturation state" means exactly.
At fixed pH 7.8 and higher alkalinity, pCO2 must be higher, or else the pH would have risen with the alkalinity.
At fixed pH 7.8 and higher alkalinity, the calcium carbonate saturation (or supersaturation) will be higher as only the amount of carbonate and calcium determine it, and at fixed pH, higher alkalinity means higher carbonate.
thus, alk dose effect the impact CO2 has.
It's a somewhat confusing statement. The higher alkalinity did not "cause" the pCO2 to be higher. But if you claimed the pH was fixed and the alkalinity was higher, then pCO2 must have been higher.
i never said alk changed pCO2 levels
I agree that it does not.
or ph in regaurds to CO2.
Well, it does do that. At a fixed pCO2, higher alkalinity leads to higher pH.
i said alk effects the impact CO2/pCO2 levels have period,
It does not impact the direction of the effect, but I agree it will impact the pH that you get for a given pCO2 or for a change pCO2.
you jumped on the idea that i meant alk effects changes in CO2. you assumed i meant Alk effects pCO2 changes. but i said alk effects the impact of pCO2 changes.
Alkalinity will impact the size of the resulting pH or supersaturation changes due to PCO2 changes, but it will not impact the direction. Higher pCO2 always lowers pH and calcium carbonate saturation.
Your posts prow are often confusing and contradictive. I you can't agree with the above you need some more studing
Something I repeated about Alk does not affect CO2 and CO2 does not effect Alk. Yet, if the Alk is higher the CO2 is higher. You have to look at how this is done. It is from buffers or the addition of an acid or base. If you add and acid like HCl the Alk goes down the and CO2 is not affected. If you add a base like NaOH or Ca(OH)2, then the pH goes up and the CO2 still remains the same. If on the other hand, we are adding buffer like BS or BBS it is different, as it is a buffer. Such carbonate buffers effect the CO2 and Alk. If you add 1 eq of BS there will be an increase of 1 eq of CO2 and 1 eq of Alk. If on the other hand it is BBS, there will still be an increase of 1 eq of CO2 but a 2 eq increase Alk. So these buffers effect both and cause shifts in all three, CO2, Alk and pH
