For statements I and II, state for each if they are true or false. I) A volumetric pipette often is used in volumetric analysis. II) A volumetric pipette can accurately transfer a measured volume of liquid into a container. If both are true, state if II is a correct explanation for I.
The first thing we need to recall is what a volumetric pipette is. Perhaps the most common form of pipette is the Pasteur pipette. But this is a single-hand-operated tool that dispenses small quantities of liquid. Then, you’ve got the graduated pipette, which has markings that make dispensing liquid a little bit more accurate. You might use a pipette bulb or pump to help you control the volume dispensed more accurately. But when it comes to dispensing a very specific volume of liquid, nothing can quite beat the volumetric pipette.
Volumetric pipettes have one job, to dispense a specific volume of liquid. This means they’re generally more accurate than similar graduated pipettes because graduated pipettes have to be relatively accurate for all their range. Volumetric analysis involves comparing volumes of different materials, for instance, in titration. For instance, we might use a burette to dispense aqueous base and measure its volume.
The more accurately and precisely we measure the volume of what we’re analysing, the better our determination of its concentration. So, statement I and statement II are both true. And the reason that volumetric pipettes are used in volumetric analysis is because they can accurately transfer a measured volume of liquid into a container. So, it’s true that II is a correct explanation for I.