# How do the Ka values for weak and strong acids compare?

Dec 2, 2015

The greater the ${K}_{a}$ value for an acid is relative to the strength of the acid, or the magnitude at which it will disassociate in water.

The closer the ${K}_{a}$ value is to one the stronger it is (the term "strong acid" means that it completely disassociates).

If you can remember the 6 strong acids you'll know that all other acids are weak:
$H C l$
$H B r$
$H I$
${H}_{2} S {O}_{4}$
$H C l {O}_{4}$
$H N {O}_{3}$