Check the equation on the way to determine the pH of seawater.
From
[H2CO3] = [H+]2・[DIC]/ ([H+]2 + K1[H+] + K1K2) equation (7)
pCO2 =[H2CO3]/K0 equation (2)
pCO2 = { [H+]2・[DIC]/ ([H+]2 + K1[H+] + K1K2) }/K0
Transform the equation,
( [H+]2 + K1[H+] + K1K2) ・K0・pCO2 = [H+]2・[DIC]
(K0・pCO2 -[DIC])[H+]2 + K1・K0・pCO2 ・[H+]+ K1K2K0・pCO2 = 0
Solve the quadratic equation for this [H+].
It is a lengthy process, but please use paper and pencil and calculate carefully.
(At this stage, the ± in front of the root cannot be determined, but assign a numerical value and choose the one that is positive.)
마지막 수정됨: 화요일, 18 7월 2023, 10:18 AM