A Mohr pipette, also known as a
graduated pipette, is a type of
pipette
A pipette (sometimes spelled as pipett) is a laboratory tool commonly used in chemistry, biology and medicine to transport a measured volume of liquid, often as a media dispenser. Pipettes come in several designs for various purposes with diffe ...
used to measure the volume of the liquid dispensed, although not as accurately as a
volumetric pipette
A volumetric pipette, bulb pipette, or belly pipette allows extremely accurate measurement (to four significant figures) of the volume of a solution. It is calibrated to deliver accurately a fixed volume of liquid.
These pipettes have a large bu ...
.
These use a series of marked lines (as on a
graduated cylinder) to indicate the different volumes. They come in a variety of sizes, and are used much like a
burette
A burette is a graduated glass tube with a tap at one end, for delivering known volumes of a liquid, especially in Titration, titrations. It is a long, graduated glass tube, with a stopcock at its lower end and a tapered capillary tube at the stop ...
, in that the volume is found by calculating the difference of the liquid level before and after.
The last graduation mark is some distance from the tip, to avoid errors in measuring the narrower volume of the nozzle.
It was invented by
Karl Friedrich Mohr
Karl Friedrich Mohr (November 4, 1806 – September 28, 1879) was a German chemist famous for his early statement of the principle of the conservation of energy. Ammonium iron(II) sulfate, (NH4)2Fe(SO4)2.6H2O, is named Mohr's salt after him.
Lif ...
, the father of volumetric analysis.
References
{{DEFAULTSORT:Mohr Pipette
Volumetric instruments