Learn Chemistry: Glossary


A glossary for Learn Chemistry explaining the meaning of chemistry terms used within this site.

Type of Activity

group work, working independently



Age Group

16 to Undergraduate
Term Definition
Effervescence Bubbling by the liberation of a gas (for example when acid is added to a carbonate solution).
End point The point in which a colour change is observed in a solution and the titre is recorded in a titration experiment.
Equivalence point When the correct (stoichiometric) amount has been added in a titration. This is not the same as the end point but if the titration is carried out properly and a suitable indicator is used the end point will be an accurate reflection of the equivalence point.
Eluate The solvent that emerges from the column in a chromatographic separation.
Eluent The solvent used in a chromatographic separation.
Elute Literally means 'to wash' and it is the term used to describe the passage of solvent through the stationary phase in chromatography.
Erlenmeyer flask An alternative name for a conical flask.
Ether The trivial name for diethyl ether.
Ethyl acetate

The trivial name for ethyl ethanoate.

Extract (verb) The action of removing a compound from a solution by shaking with an immiscible solvent.
Extract (noun) The separated immiscible liquid that has been used to extract a compound from a solution.
Extrapolation The process of constructing new data points beyond measured points, for example by extending a line of best fit beyond the plotted points.