# What is a strong acid? Strong base?

Jan 28, 2017

We assume that the solvent is water, and propose......

#### Explanation:

.....and propose that a strong acid is a species for which the following equilibrium lies to the RIGHT as written:

$H X \left(a q\right) + {H}_{2} O \left(l\right) \rightarrow {H}_{3} {O}^{+} + {X}^{-}$

And further that a strong base is an hydroxide species that gives almost complete dissociation to hydroxide ions:

MOH(aq) rarr M^+ + ""^(-)OH

Typically (but not always), both acids and bases are hydroxide species, i.e. $M {\left(O H\right)}_{x}$. The acid causes an increase in the concentration of $\text{hydronium ion}$, ${H}_{3} {O}^{+}$, and the base causes an increase in the concentration of $\text{hydroxide ion}$, ""^(-)OH.