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396:: A flask similar to the flat-bottomed flask that has round bodies and either a round bottom or a flat bottom so that one can stand the flask on a level surface. Florence flasks typically have one neck which is longer and may be somewhat wider than the usual neck of a round bottom flask. The necks of traditional Florence flasks often do not have a ground glass joint like modern round bottom flasks do. Round-bottom flasks are used more commonly by professional
457:
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36:
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are available in various sizes into which the bottoms of round-bottom flasks can fit so that the contents of a flask can be heated for distillation, chemical reactions, boiling, etc. Heating can also be accomplished by submerging the bottom of the flask into a
429:
In the United States, it is illegal for an individual to possess, manufacture, buy, or sell a three neck round bottom flask while knowing, suspecting or intending the flask's purpose to be the manufacture of illegal or controlled substances. It is
203:
with an opening at the tip. Two- or three-necked flasks are common as well. Round bottom flasks come in many sizes, from 5 mL to 20 L, with the sizes usually inscribed on the glass. In pilot plants even larger flasks are encountered.
268:
The round bottoms on these types of flasks allow more uniform heating and/or boiling of liquid. Thus, round-bottom flasks are used in a variety of applications where the contents are heated or boiled. Round-bottom flasks are used in
303:
are added in distilling flasks for distillations or boiling chemical reactions to allow a nucleation site for gradual boiling. This nucleation avoids a sudden boiling surge where the contents may overflow from the boiling flask.
222:
Because of the round bottom, cork rings are needed to keep the round bottom flasks upright. When in use, round-bottom flasks are commonly held at the neck by clamps on a stand.
226:
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by chemists as distilling flasks and receiving flasks for the distillate (see distillation diagram). One-neck round-bottom flasks are used as the distilling flasks in
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or other stirring devices suited for round-bottom flasks are sometimes used. Round bottom flasks suffer from poor stirring when compared with
372:. For gas preparation where heating is required. Since the flask is round bottomed heat is uniformly distributed throughout on heating.
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This flask shape is also more resistant to fracturing under vacuum, as a sphere more evenly distributes stress across its surface.
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390:: A flask with similar uses as the round-bottom flask, but with a flat bottom that allows it to stand on a level surface.
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230:
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is typically attached to the middle or only neck of the flask being used. Additional necks on a flask could allow a
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is common for 250 mL or larger flasks, while smaller sizes such as 14/20 or 19/22 are used for smaller flasks.
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illegal, however to possess, manufacture, buy or sell a three neck round bottom flask for legal activities.
312:, as they can't accept large stir bars and material can become trapped at the base. For a reflux set-up, a
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or a mechanical stirrer to be inserted into the flask contents. The additional necks can also allow a
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Preparation of gas-phase standards for flasks fitted with septa (requires volumetric calibration)
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406:: A spherical vessel with a long downward-pointing neck, specially used for distillation or
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156:. Both distilling (2, left) and receiving (8, right) flasks are round-bottom flasks.
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348:. Similarly cooling can be accomplished by partial submerging into a
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A round-bottom flask is featured prominently on the logo of the
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215:, and can accept any similarly-sized tapered (male) fittings.
195:; and in modern days, they are usually made of heat-resistant
29:
441:
199:
glass. There is at least one tubular section known as the
544:. Department of Chemistry. University of Alberta, Canada
520:. Department of Chemistry. University of Alberta, Canada
416:: A round-bottom flask with a built-in plug valve or
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60:. Unsourced material may be challenged and removed.
559:Legal Information Institute, Cornell University
532:. Chemistry Department. University of Rochester
484:Department of Chemistry. University of Nevada.
283:Round-bottom flasks are often used to contain
584:
8:
1544:Nuclear magnetic resonance (NMR) instrument
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207:The ends of the necks are usually conical
120:Learn how and when to remove this message
1909:Instruments used in medical laboratories
555:"21 U.S. Code § 843 – Prohibited acts C"
482:"OCS Lab Equipment: round Bottom Flask."
1425:Inductively coupled plasma (ICP) device
474:
1473:Transmission electron microscope (TEM)
7:
58:adding citations to reliable sources
1468:Scanning electron microscope (SEM)
136:Round-bottom flasks and cork rings
25:
450:Main types of round-bottom flasks
242:Heating and/or boiling of liquid.
187:work. They are typically made of
175:having spherical bottoms used as
1513:Thermogravimetric analyzer (TGA)
1323:Nuclear magnetic resonance (NMR)
287:run by chemists, especially for
229:, the implementing body for the
34:
45:needs additional citations for
1:
331:Special electrically powered
261:Storage of the culture media.
460:Twin- and triple-neck types
251:Contain chemical reactions.
231:Chemical Weapons Convention
1944:
379:
1906:
1774:
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1746:
1668:Time-domain reflectometer
1578:
1565:
1435:Liquid chromatograph (LC)
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1385:
1058:
1045:
617:
606:
352:, filled with e.g. cold
1503:Melting-point apparatus
884:Cryogenic storage dewar
1440:Mass spectrometer (MS)
1430:Gas chromatograph (GC)
461:
451:
368:/solvent mixtures, or
324:to be attached to let
157:
137:
1815:Acid-resistant gloves
1496:differential scanning
459:
449:
400:than Florence flasks.
165:round-bottomed flasks
143:
135:
1928:Laboratory glassware
1392:Analytical chemistry
894:Laminar flow cabinet
600:Laboratory equipment
254:Distilling flask in
177:laboratory glassware
154:fractionating column
69:"Round-bottom flask"
54:improve this article
27:Laboratory equipment
1764:Personal protective
673:Meker–Fisher burner
530:"Reaction Notes 2."
388:Flat-bottomed flask
209:ground glass joints
161:Round-bottom flasks
1607:Function generator
1590:Bench power supply
1529:Analytical balance
1290:Ostwald viscometer
1285:Graduated cylinder
1024:Inoculation needle
462:
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285:chemical reactions
275:rotary evaporators
256:Rotary evaporators
158:
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18:Round bottom flask
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1898:
1897:
1875:Fire extinguisher
1865:Biosafety cabinet
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1673:Transistor tester
1663:Spectrum analyzer
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1253:Measuring devices
1075:Soxhlet extractor
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989:Spectrophotometer
984:Pipeclay triangle
736:Mortar and pestle
466:
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382:Laboratory flasks
376:Related glassware
328:slowly drip in.
310:Erlenmeyer flasks
130:
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16:(Redirected from
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1653:Network analyzer
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1029:Inoculation loop
899:Microtiter plate
839:Test tube holder
731:Magnetic stirrer
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408:dry distillation
150:Liebig condenser
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1890:Solvent cabinet
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1820:Eyewash station
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1766:equipment (PPE)
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1617:Pulse generator
1583:Control devices
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1483:Thermochemistry
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1265:Conical measure
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1014:Test tube brush
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909:Picotiter plate
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854:Lab drying rack
813:Extension clamp
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370:liquid nitrogen
333:heating mantles
322:dropping funnel
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171:) are types of
148:set-up using a
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1885:Safety cabinet
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1845:Safety goggles
1842:
1840:Safety glasses
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1835:Nitrile gloves
1832:
1830:Medical gloves
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1600:Voltage source
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1173:Vacuum (Dewar)
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726:Liquid whistle
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691:Vacuum dry box
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653:Heating mantle
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638:Alcohol burner
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394:Florence flask
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380:Main article:
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1799:Safety shower
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1709:Wire stripper
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1539:Spiral plater
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1403:Compositional
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945:Balance brush
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921:Weighing dish
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918:Weighing boat
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809:Burette clamp
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414:Schlenk flask
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306:Stirring bars
302:
301:Boiling chips
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191:for chemical
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179:, mostly for
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163:(also called
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113:
110:December 2009
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74:
71: –
70:
66:
65:Find sources:
59:
55:
49:
48:
43:This article
41:
37:
32:
31:
19:
1870:Fire blanket
1808:Eye and hand
1794:Rubber apron
1658:Oscilloscope
1622:Potentiostat
1549:Plate reader
1445:pH indicator
1415:CHN analyzer
1410:AutoAnalyzer
1203:Round-bottom
1202:
1096:Boston round
959:Filter paper
914:Refrigerator
831:Retort stand
799:Clamp holder
795:Beaker clamp
761:Vortex mixer
756:Stirring rod
751:Static mixer
681:Teclu burner
558:
549:
542:Distillation
537:
525:
513:
502:. Retrieved
498:
489:
477:
431:
428:
350:cooling bath
332:
330:
291:set-ups and
282:
279:
271:distillation
267:
246:Distillation
224:
221:
213:standardized
211:. These are
206:
200:
197:borosilicate
168:
164:
160:
159:
152:, without a
146:distillation
116:
107:
97:
90:
83:
76:
64:
52:Please help
47:verification
44:
1858:Other items
1784:Face shield
1631:Measurement
1612:Galvanostat
1572:Electronics
1522:Other items
1508:Thermometer
1491:Calorimeter
1420:Colorimeter
1364:Gas syringe
1347:Other items
1275:Eye dropper
1150:Watch glass
1135:Evaporating
1114:Cold finger
929:Other items
835:Screw clamp
827:Pinch clamp
816:Flask clamp
766:Wash bottle
721:Homogenizer
495:"OPCW Logo"
318:thermometer
185:biochemical
144:Laboratory
1789:Respirator
1730:Test probe
1648:Multimeter
1460:Microscopy
1280:Eudiometer
1244:Separatory
1213:Volumetric
1178:Erlenmeyer
1106:Condensers
1070:Dean–Stark
1019:Wire brush
979:Microscope
974:Centrifuge
949:Cork borer
904:Petri dish
879:Agar plate
866:Containers
849:Wire gauze
686:Water bath
648:Desiccator
504:2020-08-13
469:References
364:mixtures,
342:water bath
293:laboratory
80:newspapers
1880:Fume hood
1825:Glove box
1678:Voltmeter
1063:Apparatus
1052:Glassware
941:Autoclave
936:Aspirator
889:Incubator
823:Iron ring
746:Sonicator
716:Chemostat
658:Hot plate
346:sand bath
338:heat bath
326:reactants
314:condenser
297:synthesis
193:inertness
169:RB flasks
1922:Category
1779:Lab coat
1704:Tweezers
1694:Heat gun
1450:pH meter
1359:Bell jar
1239:Dropping
1193:Florence
1183:Fernbach
1145:Syracuse
1004:Scoopula
954:Crucible
663:Lab oven
425:Legality
418:stopcock
398:chemists
362:eutectic
181:chemical
1718:General
1638:Ammeter
1338:Thistle
1295:Pipette
1270:Cuvette
1260:Burette
1229:BĂĽchner
1222:Funnels
1208:Schlenk
1188:Fleaker
1168:BĂĽchner
1089:Bottles
1009:Spatula
999:Stopper
969:Forceps
869:Storage
786:Holders
706:Shakers
677:Striker
625:Heaters
612:General
438:Gallery
366:dry ice
295:-scale
94:scholar
1752:Safety
1354:Beaker
1333:Thiele
1318:Cragie
1313:Drying
1234:Hirsch
1198:Retort
1160:Flasks
1128:Dishes
1119:Liebig
1080:Kipp's
994:Splint
804:Tripod
782:Clamps
778:Stands
741:Shaker
703:Mixers
628:Dryers
518:Reflux
404:Retort
289:reflux
173:flasks
96:
89:
82:
75:
67:
1687:Tools
1305:Tubes
1140:Petri
354:water
344:, or
217:24/40
189:glass
101:JSTOR
87:books
1369:Vial
1328:Test
964:File
668:Kiln
499:OPCW
237:Uses
227:OPCW
201:neck
73:news
432:not
358:ice
183:or
167:or
56:by
1924::
557:.
497:.
360:,
356:,
340:,
299:.
277:.
233:.
592:e
585:t
578:v
561:.
507:.
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258:.
248:.
123:)
117:(
112:)
108:(
98:·
91:·
84:·
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50:.
20:)
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