Hello, I've been struggling with this exercise because I don't know which pH result is correct.

I was given:

**Calculate pH**

pKa = 10.25

[HCO^{-}_{3}] = 25.2 mmol/L --> 2.52 x10^{-3}

[CO_{3}^{-2}] = 32.0 umol/L --> 3.2 x10^{-5}

So, pH = pKa + log ([A^{-}]/[HA])

The correct answer should be (the answer in the book): pH = 7.4

But I keep getting: pH = 13.1, __what am I doing wrong?__

chaconsara32 Jun 19, 2020