J.R. S. answered 05/04/21
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Henderson Hasselbalch equation:
pH = pKa + log [salt] / [acid]
pKa = -log Ka = 4.19
pH = 4.19 + log (0.375 / 0.375) = 4.19 + log 1 = 4.19 + 0
pH = 4.19