Final answer:
The pipette described with a bulge in the middle is known as a volumetric pipette, which is crucial for precise volume measurement in analytical chemistry tasks like titrations. So, the correct answer is option a.
Step-by-step explanation:
The pipette with a bulged out portion in the middle is called a volumetric pipette. It is designed to measure a single, precise volume of liquid. This is different from a buret, which can dispense variable volumes, or a graduated cylinder, which is also used to measure various volumes but with less precision compared to a volumetric pipette.
The volumetric pipette is a crucial tool especially in analytical chemistry where precise volume measurements are essential, such as in titrations and when making solutions with specific concentrations.
So, the correct answer is option a.