Molarity of weak Acid (HA) = 1.3M
HA ------------ H+ + A-
Acid is ionized 2.8% i.e.
Molarity of H+ ion = [H+] = (1.3*2.8)/100 = 0.0364M
pH = -log[H+] = -log(0.0364) = 1.439
pH = 1.439 ...... Answer
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