Answer :
The pH is given by the Henderson - Hasselbalch equation:
pH = pKa + log([A-]/[HA])
pH = -log(1.3 x 10^-5) + log(0.50/0.40)
pH = 4.98
The answer to this question is 4.98.
pH = pKa + log([A-]/[HA])
pH = -log(1.3 x 10^-5) + log(0.50/0.40)
pH = 4.98
The answer to this question is 4.98.