This equals, remember, PKA is simply negative log of Ka. So this equals negative log of Ka. And our Ka is 3.1
times tens of eight. So we plug it into here plus log of this guy over this guy we get 0.07 over 0.05
approximately equals we plug this into our calculator and we get 2.65. So that's our PH. Now let's find using the same PH using the Ka.