Have you tried to get it right first without the Van 't Hoff corrections?

Your formula uses two constants - 29.42 and -2400 - that are not clear to me.

I mean: I could probably attempt to guess where they came from, but it would be better if you explain everything from the very beginning. So far I am guessing my way through things you have never stated, it is a waste of time

Yeah, when I run the numbers without altering the temp (aka, just using Henry's constant as-is), the amounts change slightly, but nothing notable

Sorry, I take for granted that I have figured parts out, and haven't expressly shared the logic I am using

Also, I am reviewing my code, I made some mistakes when I "translated" my code to an equation

The Equation should read like this:

C = (P/10^6) / 29.76 * exp(2400/8.314*(1/(T+273.15)-1/298.15))

C(ppm) = C * 44.1 * 1000

C = Concentration in Water

P = PPM of co2 in cup

C(ppm) = Concentration in PPM

T = Temp in Celsius

Here is where I got the constants from:

29.76 is Henry's constant for CO2 with STP. I can't find the exact resource I used to learn that, but this

website confirms it (I had a slightly different number but this seems to be the correct one)

8.314 is the Molar Gas Constant

2400 is the value given as the constant on the same page I listed above

also, after going over some of the resources, I altered Henry's Constant by using the equation below, opposed to the van't Hoff equation:

kH(T) = k°H exp(d(ln(kH))/d(1/T) ((1/T) - 1/(298.15 K)))

Sorry, I REALLY didn't want to make so many mistakes, but this is a project I have been working on for a while, andI got a little confused