Question

Plzz answer my question

Answer 1

According to me it's 4.8.
Hope it helps you. Mark this answer as brainlist plz.
By that:
pH= pKa + log ([HCOO]-/[HCOOH])
pH=3.8 +log (0.50M/0.27M)
{M and M got cut}
pH=3.8 + log (0.50/0.27)
pH=3.8 +0.268
pH= 4.068
pH= 407 or 4.8 (approx)