Estimating Henrys Law constant C02

[febbie22]

I was given the table below all i want to do is estimate the Henry's constant at -10 and 60 degrees. Just wondering the best way to go about this.

Would it be to take the log of the graph and add a treadline?

HENRY’S LAW CONSTANT FOR CO2

TEMPERATURE (0C)

HENRY’S LAW CONSTANT (Kh/10,000, atm)​

0

0.073​

10

0.104​

20

0.142​

30

0.186​

40

0.233
​

Cheers.

 

[rude man]

You should fit your data to theory:

k(T) = k(T0)exp(-k1/T + k2)

where k(T0) ~ 0.142
k1 ~ 2400 for CO2
k2 ~ k1/T0

I would set k1 and k2 to the above values exactly and then fit the data for k(T0) only, but maybe that would probably be cheating.

 

[febbie22]

I think i have to do the log of the graph then use quadratics and polynomials to compare and conclude. Does anyone know how i can use polynomial treadlined graphs to calculate the henry's constant which is in the x axis.