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<p>[QUOTE="2manybooks, post: 4425405, member: 8267"]Used in complex chemistry lab reactions:</p><ul> <li>Reaction flasks, which are usually spherical (i.e. round-bottom flask) and are accompanied by their necks, at the ends of which are ground glass joints to quickly and tightly connect to the rest of the apparatus (such as a reflux condenser or dropping funnel). The reaction flask is usually made of thick glass and can tolerate large pressure differences, with the result that one can be kept both in a reaction under vacuum, and pressure, sometimes simultaneously. Some varieties are:<ul> <li>Multiple neck flasks, which can have two to five, and less commonly, six necks, each topped by ground glass connections which are used in more complex reactions that require the controlled mixing of multiple reagents.</li> <li><a href="https://en.wikipedia.org/wiki/Schlenk_flask" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://en.wikipedia.org/wiki/Schlenk_flask" rel="nofollow">Schlenk flask</a>, which is a spherical flask with a ground glass opening and a hose outlet and a vacuum stopcock. The tap makes it easy to connect the flask to a vacuum-nitrogen line through the hose and to facilitate the carrying out of a reaction either in vacuum or in an atmosphere of nitrogen. </li> </ul></li> </ul><p><a href="https://en.wikipedia.org/wiki/Laboratory_flask" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://en.wikipedia.org/wiki/Laboratory_flask" rel="nofollow">https://en.wikipedia.org/wiki/Laboratory_flask</a>[/QUOTE]</p><p><br /></p>
[QUOTE="2manybooks, post: 4425405, member: 8267"]Used in complex chemistry lab reactions: [LIST] [*]Reaction flasks, which are usually spherical (i.e. round-bottom flask) and are accompanied by their necks, at the ends of which are ground glass joints to quickly and tightly connect to the rest of the apparatus (such as a reflux condenser or dropping funnel). The reaction flask is usually made of thick glass and can tolerate large pressure differences, with the result that one can be kept both in a reaction under vacuum, and pressure, sometimes simultaneously. Some varieties are: [LIST] [*]Multiple neck flasks, which can have two to five, and less commonly, six necks, each topped by ground glass connections which are used in more complex reactions that require the controlled mixing of multiple reagents. [*][URL='https://en.wikipedia.org/wiki/Schlenk_flask']Schlenk flask[/URL], which is a spherical flask with a ground glass opening and a hose outlet and a vacuum stopcock. The tap makes it easy to connect the flask to a vacuum-nitrogen line through the hose and to facilitate the carrying out of a reaction either in vacuum or in an atmosphere of nitrogen. [/LIST] [/LIST] [URL]https://en.wikipedia.org/wiki/Laboratory_flask[/URL][/QUOTE]
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