$H_3O^+\;+\;OH^-\;$ $\rightarrow$ $\;2H_2O$
$V_{acid}=$ $mL$ $c_{acid}=\;$ $\frac{mol}{L}$ $c_{base}=\;\;$ $\frac{mol}{L}$
1) Introduce numbers like 0.45 2) Choose a volume between 5 and 25 $mL$ 3) Choose molarities beween 0,05 and 0,25 $M$