HNO3 is a strong acid pH = -log[H+] = -log[0.05] = 1.3 pOH = 14 - pH = 14 - 1.3 = 12.7 Solution HNO3 is a strong acid pH = -log[H+] = -log[0.05] = 1.3 pOH = 14 - pH = 14 - 1.3 = 12.7.Read less