Question

There are several different equations to use when calculating pH or pOH. Can I use them...

There are several different equations to use when calculating pH or pOH.

Can I use them in every different scenario, are they all correct? Is there any else?

1) pH=pKa+log[A-/HA] or pOH=pKb+log[B/HB]

2)pH=1/2(pKw+pKa+log(c)) or pOH=1/2(pKw-pKb+log(c)) c for concentration

3)pH=1/2(pKw+pKa-pKb) or pOH=1/2(pKw-pKa+pKb)

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