# What do we mean by concentration with respect to an acid? What is a concentrated acid?

Aug 20, 2017

The concentration of an acid depends on the number of acidic particles in the solvent.

#### Explanation:

An acid such as $H C l$ decomposes in aqueous (in water) solution according to the following reaction.....

$H C l \left(g\right) \stackrel{{H}_{2} O}{\rightarrow} {H}^{+} + C {l}^{-}$

Concentration depends on the number of acidic particles per litre of solution, i.e.

$\text{Concentration"="Moles of solute (mol)"/"Volume of solution (L)}$, and thus it has the typical units of $m o l \cdot {L}^{-} 1$, where ${L}^{-} 1 = \frac{1}{L} ^ 1 = \frac{1}{L}$.

Typically concentrated acids are FORMALLY $> 1 \cdot m o l \cdot {L}^{-} 1$.

Dilute acids have concentrations $< 1 \cdot m o l \cdot {L}^{-} 1$. Both strong and weak acids can be concentrated. Again the strength (NOT concentration) of an acid depends on the extent of the given equilibrium.

Is this a bit too abstract? Possibly. If you want to clarify your knowledge/understanding please pin us down for an answer.

Aug 20, 2017

#### Explanation:

I think Simon explained it quite well.