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The beaker is primarily designed for mixing chemicals and measuring approximate volumes. Its wide mouth and straight sides allow for easy stirring, pouring, and the observation of contents, making it ideal for experimental procedures where precise measurements are less critical.

While flasks can also be used for mixing, they are typically more suited for reactions where the contents need to be contained more securely, often featuring narrow necks to minimize evaporation. Test tubes are intended for holding and mixing small quantities of liquids but lack the volume measurement markings present on beakers. Graduated cylinders, while excellent for measuring volumes accurately, are typically not used for mixing because their narrow shape does not allow for easy stirring.

In contexts where loose measurements and mixing are required, the beaker stands out as the most appropriate choice, indicating its primary role in laboratory settings.