Which piece of equipment would you use to stir solutions in a beaker?

A stirring rod is specifically designed for mixing and stirring solutions within a beaker. Its long, slender shape allows for effective movement of the liquid, ensuring that the components are well mixed without splashing. The material of the stirring rod, usually made of glass or plastic, is also suitable for use with various chemicals, making it a versatile tool in the laboratory setting.

In contrast, other options serve different purposes. A test tube brush is intended for cleaning test tubes and would not be effective for stirring solutions. A spatula is typically used for transferring solids or powder and does not provide the same mixing capability as a stirring rod. A wash bottle is used for dispensing liquids, usually water or solvent, for rinsing purposes rather than for stirring. Thus, the stirring rod is the appropriate choice for the task of stirring solutions in a beaker.