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Round-bottom flasks are used more commonly by professional chemists than Florence flasks. Retort: A spherical vessel with a long downward-pointing neck, specially used for distillation or dry distillation of substances. Schlenk flask: A round-bottom flask with a built-in plug valve or stopcock.
A Florence flask has a round body, a long neck, and often a flat bottom. It is designed for uniform heating, boiling, distillation and ease of swirling; it is produced in a number of different glass thicknesses to stand different types of use.
Retorts are simplified distillation apparatuses, with long, down turned necks, and round bases. They have largely been replaced by condensers. Büchner flask or Sidearm flask or Suction flask—they are a flat-bottomed flask, but made of very thick and resistant glass. They are usually a cone shape—similar to the shape of an Erlenmeyer flask ...
A pear-shaped Schlenk flask. The flask's sidearm contains a greased stopcock valve, and the flask is capped with a Suba•Seal septum that has not been turned down. The standard Schlenk flask is a round bottom, pear-shaped, or tubular flask with a ground glass joint and a side arm.
Round-bottom flasks often have one or more conically tapered ground glass joint openings, or necks. Conventionally, these joints at the flask necks are outer joints. Other adapters, such as distillation heads and vacuum adapters, are made with joints that fit in with this convention.
A round-bottom boiling flask with ground glass joints are affixed to either side of the apparatus with Keck clips. The unusually shaped Likens-Nickerson apparatus uses two boiling flasks. One flask is loaded with an aqueous solution containing the desired compound(s) and the other with immiscible organic solvent.
A copper retort A glass retort. In a chemistry laboratory, a retort is a device used for distillation or dry distillation of substances. It consists of a spherical vessel with a long downward-pointing neck.
Distillation using semi-microscale apparatus. The jointless design eliminates the need to fit pieces together. The pear-shaped flask allows the last drop of residue to be removed, compared with a similarly sized round-bottom flask. The small holdup volume prevents losses. A "pig" is used to channel the various distillates into three receiving ...
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