# How do we assess the concentration of an acid?

Of course you have to prepare the sample......i.e. dilute it so that it will reach a stoichiometric endpoint with a volume of $20 \cdot m L$ of standardized $N a O H \left(a q\right)$ titrant according to the equation.....
$H C l \left(a q\right) + N a O H \left(a q\right) \rightarrow N a C l \left(a q\right) + {H}_{2} O \left(l\right)$