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There are (at least) two reasons to consider: accuracy and precision. Accuracy as in preparing a stem solution of $\pu{100 mL}$ with a balance right to say $\pu{0.1 g}$ or a graduated cylinders right to the full $\pu{1 mL}$ is easier, than for $\pu{20 mL}$. Depending on the class, volumetric flasks may be better in terms of absolute / relative error than ...


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