Strong Acid Dissociation Constants at 25°C

Generally speaking, these values are not used in calculations since, at common concentrations in chemistry, each substance is 100% dissociated.

Acid NameFormulaKa
hydroiodicHI3.2 x 109
hydrobromicHBr1.0 x 109
perbromicHBrO43.2 x 108
perchloricHClO41.0 x 108
hydrochloricHCl1.3 x 107
sulfuric (Ka1)H2SO41.0 x 103

In many textbooks, the above values are never discussed and the author will often write this about the Ka of a strong acid:

Ka >> 1

And the exact values are never discussed.

Strong Base Dissociation Constants at 25°C

There is significantly less information on Kb values for common strong bases than there is for the Ka for common strong acids. The closest I could find was the following sentence "Bases with pK less than zero are shown as 'strong.' " The following bases are listed as strong:

Base NameFormula
Sodium hydroxideNaOH
Potassium hydroxideKOH
Rubidium hydroxideRbOH
Cesium hydroxideCsOH
Calcium hydroxideCa(OH)2
Strontium hydroxideSr(OH)2
Barium hydroxideBa(OH)2

In textbooks where this idea is discussed, one often sees this statement about the Kb of a strong base:

Kb >> 1

And the exact values are never discussed.