Problem: Which of the following solutions is the most acidic?(a) 0.2 M LiOH(b) 0.2 M HI(c) 1.0 M methanol (CH3OH)

We’re being asked to identify which of the solutions is the most acidic.

Strong acids are considered strong electrolytes. They completely dissociate into ions when dissolved in water.

• Strong binary acids – paired with a highly electronegative atom

Common strong binary acids are:             HCl, HBr, and HI

• Strong oxyacids (or oxoacids) - have 2 or more oxygens than hydrogens

Common strong oxyacids are:                 HNO₃, HClO₃, HClO₄, H₂SO₄

Exceptions to the rule are:                       Oxalic acid (H₂C₂O₄) and Iodic acid (HIO₃)

▪ both have 2 more O than H but are weak acids because carbon and iodine have low electronegativity