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Question Video: Explaining Why a Volumetric Pipet Would Be Used to Measure a Known Volume Chemistry

Why is a volumetric pipet used to measure out the known volume (aliquot) of a solution?


Video Transcript

Why is a volumetric pipet used to measure out the known volume, aliquot, of a solution?

Let’s have a look at in what situations a volumetric pipet would be used to answer this question.

One example of a common analytical technique during which a volumetric pipet is often used is a titration. A titration is a precise procedure that involves using a clamped buret to add a volume of solution into a conical flask containing another solution. The solution of known identity and concentration is often added to the buret. The known solution is used to collect data regarding the other unknown solution, which in this example is contained in the conical flask.

In order for this analysis to be reliable, it is extremely important that the known solution be accurately standardized and measured. Additionally, while we may not know the identity or concentration of the unknown solution, it must be measured very precisely so the titration data will be useful. For this reason, volumetric pipets are often used when measuring substances for titrations.

A volumetric pipet has one single gradation as it measures a single, specific quantity of liquid to a very high degree of accuracy. A bulb is usually used to control liquid entering and exiting the opening of the pipet when transferring and measuring solutions. Though a volumetric pipet measures only one fixed volume, it does so very accurately and is commonly used for analytical techniques, such as titrations. Therefore, a volumetric pipet is used to measure out the known volume, aliquot, of a solution to allow a very accurate, fixed volume of a solution to be measured.

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