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The primary purpose of using distillation apparatus in laboratories is centered around the process of heating and refluxing solvents to separate components based on their boiling points, ultimately allowing for the recovery of high-purity substances. During distillation, a liquid mixture is heated to create vapor, and as the vapor rises, it cools and condenses back into a liquid in a separate container. This allows the more volatile components to be separated effectively from less volatile substances or impurities present in the original mixture.

This technique is vital in various laboratory applications, including the purification of solvents, recovery of specific compounds from mixtures, and preparation of samples for further chemical analysis. The ability to target specific boiling points enhances the purity of the collected distillate, making distillation a critical procedure in both research and practical chemistry.

As for the other options, cooling liquids, mixing chemicals, and storing chemicals safely, while important tasks in laboratory settings, do not encapsulate the primary function and significance of using distillation apparatus specifically. Therefore, the focus and effectiveness of distillation lie in its role in purifying and separating substances rather than performing these other functions.