Editing Erlenmeyer flask (section)

===In chemistry===
[[File:Titration NaOH HCl PP.ogv|thumb|Method of swirling an Erlenmeyer flask during [[titration]]]]

The slanted sides and narrow neck of this flask allow the contents of the flask to be mixed by swirling, without risk of spillage, making them suitable for [[titrations]] by placing it under the [[Burette|buret]] and adding solvent and the indicator in the Erlenmeyer flask.<ref>{{cite web|url=http://www.sciencebuddies.org/science-fair-projects/titration_tutorial.shtml |title= Method of titration |website=www.sciencebuddies.org/ |access-date=2016-07-08}}</ref> Such features similarly make the flask suitable for boiling liquids. Hot vapour condenses on the upper section of the Erlenmeyer flask, reducing [[solvent]] loss. Erlenmeyer flasks' narrow necks can also support [[filter funnel]]s.

The final two attributes of Erlenmeyer flasks make them especially appropriate for [[recrystallization (chemistry)|recrystallization]]. The sample to be purified is heated to a boil, and sufficient solvent is added for complete [[Dissolution (chemistry)|dissolution]].  The receiving flask is filled with a small amount of solvent, and heated to a boil. The hot solution is filtered through a fluted filter paper into the receiving flask. Hot vapors from the boiling solvent keep the filter funnel warm, avoiding the premature [[crystallization]].

Like [[Beaker (glassware)|beakers]], Erlenmeyer flasks are not normally suitable for accurate volumetric measurements. Their stamped volumes are approximate within about 5% accuracy.<ref>{{cite web |url=https://www.dartmouth.edu/~chemlab/techniques/flasks.html |title=Erlenmeyer Flasks and Beakers |website=www.dartmouth.edu |access-date=2016-06-17 |archive-url=https://web.archive.org/web/20160616181106/http://www.dartmouth.edu/~chemlab/techniques/flasks.html |archive-date=2016-06-16 |url-status=dead }}</ref>