Strongest
HClO4 perchloric acid
HI hydroiodic acid
HBr hydrobromic acid
HCl hydrochloric acid
HNO3 nitric acid
H2SO4 sulfuric acid (diprotic)
CH3COOH acetic acid
HCOOH formic acid
HF hydrofluoric acid
HCN hydrocyanic acid
HNO2 nitrous acid
HSO4- hydrogen sulfate ion
Weakest