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385:: 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
122:
25:
324:
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
418:
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
192:
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.
257:
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
292:
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.
211:
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.
262:
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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297:
or other stirring devices suited for round-bottom flasks are sometimes used. Round bottom flasks suffer from poor stirring when compared with
1808:
1787:
361:. For gas preparation where heating is required. Since the flask is round bottomed heat is uniformly distributed throughout on heating.
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269:
This flask shape is also more resistant to fracturing under vacuum, as a sphere more evenly distributes stress across its surface.
89:
1423:
61:
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379:: A flask with similar uses as the round-bottom flask, but with a flat bottom that allows it to stand on a level surface.
42:
572:
1484:
305:
is typically attached to the middle or only neck of the flask being used. Additional necks on a flask could allow a
108:
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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.
75:
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46:
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illegal, however to possess, manufacture, buy or sell a three neck round bottom flask for legal activities.
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301:, as they can't accept large stir bars and material can become trapped at the base. For a reflux set-up, a
219:
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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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82:
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842:
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395:: A spherical vessel with a long downward-pointing neck, specially used for distillation or
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145:. Both distilling (2, left) and receiving (8, right) flasks are round-bottom flasks.
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337:. 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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204:, and can accept any similarly-sized tapered (male) fittings.
184:; and in modern days, they are usually made of heat-resistant
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glass. There is at least one tubular section known as the
346:
533:. Department of Chemistry. University of Alberta, Canada
509:. Department of Chemistry. University of Alberta, Canada
405:: A round-bottom flask with a built-in plug valve or
49:. Unsourced material may be challenged and removed.
1908:
548:Legal Information Institute, Cornell University
521:. Chemistry Department. University of Rochester
473:Department of Chemistry. University of Nevada.
272:Round-bottom flasks are often used to contain
573:
1533:Nuclear magnetic resonance (NMR) instrument
580:
566:
196:The ends of the necks are usually conical
109:Learn how and when to remove this message
1898:Instruments used in medical laboratories
1379:
587:
544:"21 U.S. Code § 843 – Prohibited acts C"
471:"OCS Lab Equipment: round Bottom Flask."
444:
434:
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1414:Inductively coupled plasma (ICP) device
1909:
1462:Transmission electron microscope (TEM)
1739:
1558:
1378:
1038:
599:
561:
364:
47:adding citations to reliable sources
18:
13:
1457:Scanning electron microscope (SEM)
125:Round-bottom flasks and cork rings
14:
1928:
439:Main types of round-bottom flasks
231:Heating and/or boiling of liquid.
176:work. They are typically made of
164:having spherical bottoms used as
1502:Thermogravimetric analyzer (TGA)
1312:Nuclear magnetic resonance (NMR)
276:run by chemists, especially for
218:, the implementing body for the
23:
1559:
34:needs additional citations for
536:
524:
512:
500:
476:
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1:
1039:
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320:Special electrically powered
250:Storage of the culture media.
7:
600:
449:Twin- and triple-neck types
413:
240:Contain chemical reactions.
220:Chemical Weapons Convention
10:
1933:
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426:
368:
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1657:Time-domain reflectometer
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1424:Liquid chromatograph (LC)
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341:, filled with e.g. cold
1492:Melting-point apparatus
873:Cryogenic storage dewar
225:
1429:Mass spectrometer (MS)
1419:Gas chromatograph (GC)
450:
440:
357:/solvent mixtures, or
313:to be attached to let
146:
126:
1804:Acid-resistant gloves
1485:differential scanning
448:
438:
389:than Florence flasks.
154:round-bottomed flasks
132:
124:
1917:Laboratory glassware
1381:Analytical chemistry
883:Laminar flow cabinet
589:Laboratory equipment
243:Distilling flask in
166:laboratory glassware
143:fractionating column
58:"Round-bottom flask"
43:improve this article
16:Laboratory equipment
1753:Personal protective
662:Meker–Fisher burner
519:"Reaction Notes 2."
377:Flat-bottomed flask
198:ground glass joints
150:Round-bottom flasks
1596:Function generator
1579:Bench power supply
1518:Analytical balance
1279:Ostwald viscometer
1274:Graduated cylinder
1013:Inoculation needle
451:
441:
274:chemical reactions
264:rotary evaporators
245:Rotary evaporators
147:
127:
1904:
1903:
1891:
1890:
1887:
1886:
1864:Fire extinguisher
1854:Biosafety cabinet
1842:
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1662:Transistor tester
1652:Spectrum analyzer
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1242:Measuring devices
1064:Soxhlet extractor
1030:
1029:
1026:
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978:Spectrophotometer
973:Pipeclay triangle
725:Mortar and pestle
455:
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371:Laboratory flasks
365:Related glassware
317:slowly drip in.
299:Erlenmeyer flasks
119:
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93:
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1642:Network analyzer
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1018:Inoculation loop
888:Microtiter plate
828:Test tube holder
720:Magnetic stirrer
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397:dry distillation
139:Liebig condenser
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1879:Solvent cabinet
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1809:Eyewash station
1792:
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1755:equipment (PPE)
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1671:
1615:
1606:Pulse generator
1572:Control devices
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1472:Thermochemistry
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1288:
1254:Conical measure
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1003:Test tube brush
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898:Picotiter plate
861:
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843:Lab drying rack
802:Extension clamp
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359:liquid nitrogen
322:heating mantles
311:dropping funnel
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160:) are types of
137:set-up using a
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1874:Safety cabinet
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1834:Safety goggles
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1829:Safety glasses
1826:
1824:Nitrile gloves
1821:
1819:Medical gloves
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1714:Alligator clip
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1632:Logic analyzer
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1589:Voltage source
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1162:Vacuum (Dewar)
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715:Liquid whistle
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680:Vacuum dry box
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642:Heating mantle
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627:Alcohol burner
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399:of substances.
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383:Florence flask
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369:Main article:
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1788:Safety shower
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1698:Wire stripper
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1528:Spiral plater
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1392:Compositional
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934:Balance brush
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910:Weighing dish
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907:Weighing boat
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295:Stirring bars
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290:Boiling chips
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168:, mostly for
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152:(also called
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99:December 2009
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63:
60: –
59:
55:
54:Find sources:
48:
44:
38:
37:
32:This article
30:
26:
21:
20:
1859:Fire blanket
1797:Eye and hand
1783:Rubber apron
1647:Oscilloscope
1611:Potentiostat
1538:Plate reader
1434:pH indicator
1404:CHN analyzer
1399:AutoAnalyzer
1192:Round-bottom
1191:
1085:Boston round
948:Filter paper
903:Refrigerator
820:Retort stand
788:Clamp holder
784:Beaker clamp
750:Vortex mixer
745:Stirring rod
740:Static mixer
670:Teclu burner
547:
538:
531:Distillation
526:
514:
502:
491:. Retrieved
487:
478:
466:
420:
417:
339:cooling bath
321:
319:
280:set-ups and
271:
268:
260:distillation
256:
235:Distillation
213:
210:
202:standardized
200:. These are
195:
189:
186:borosilicate
157:
153:
149:
148:
141:, without a
135:distillation
105:
96:
86:
79:
72:
65:
53:
41:Please help
36:verification
33:
1847:Other items
1773:Face shield
1620:Measurement
1601:Galvanostat
1561:Electronics
1511:Other items
1497:Thermometer
1480:Calorimeter
1409:Colorimeter
1353:Gas syringe
1336:Other items
1264:Eye dropper
1139:Watch glass
1124:Evaporating
1103:Cold finger
918:Other items
824:Screw clamp
816:Pinch clamp
805:Flask clamp
755:Wash bottle
710:Homogenizer
484:"OPCW Logo"
307:thermometer
174:biochemical
133:Laboratory
1778:Respirator
1719:Test probe
1637:Multimeter
1449:Microscopy
1269:Eudiometer
1233:Separatory
1202:Volumetric
1167:Erlenmeyer
1095:Condensers
1059:Dean–Stark
1008:Wire brush
968:Microscope
963:Centrifuge
938:Cork borer
893:Petri dish
868:Agar plate
855:Containers
838:Wire gauze
675:Water bath
637:Desiccator
493:2020-08-13
458:References
353:mixtures,
331:water bath
282:laboratory
69:newspapers
1869:Fume hood
1814:Glove box
1667:Voltmeter
1052:Apparatus
1041:Glassware
930:Autoclave
925:Aspirator
878:Incubator
812:Iron ring
735:Sonicator
705:Chemostat
647:Hot plate
335:sand bath
327:heat bath
315:reactants
303:condenser
286:synthesis
182:inertness
158:RB flasks
1911:Category
1768:Lab coat
1693:Tweezers
1683:Heat gun
1439:pH meter
1348:Bell jar
1228:Dropping
1182:Florence
1172:Fernbach
1134:Syracuse
993:Scoopula
943:Crucible
652:Lab oven
414:Legality
407:stopcock
387:chemists
351:eutectic
170:chemical
1707:General
1627:Ammeter
1327:Thistle
1284:Pipette
1259:Cuvette
1249:Burette
1218:BĂĽchner
1211:Funnels
1197:Schlenk
1177:Fleaker
1157:BĂĽchner
1078:Bottles
998:Spatula
988:Stopper
958:Forceps
858:Storage
775:Holders
695:Shakers
666:Striker
614:Heaters
601:General
427:Gallery
355:dry ice
284:-scale
83:scholar
1741:Safety
1343:Beaker
1322:Thiele
1307:Cragie
1302:Drying
1223:Hirsch
1187:Retort
1149:Flasks
1117:Dishes
1108:Liebig
1069:Kipp's
983:Splint
793:Tripod
771:Clamps
767:Stands
730:Shaker
692:Mixers
617:Dryers
507:Reflux
393:Retort
278:reflux
162:flasks
85:
78:
71:
64:
56:
1676:Tools
1294:Tubes
1129:Petri
343:water
333:, or
206:24/40
178:glass
90:JSTOR
76:books
1358:Vial
1317:Test
953:File
657:Kiln
488:OPCW
226:Uses
216:OPCW
190:neck
62:news
421:not
347:ice
172:or
156:or
45:by
1913::
546:.
486:.
349:,
345:,
329:,
288:.
266:.
222:.
581:e
574:t
567:v
550:.
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237:.
112:)
106:(
101:)
97:(
87:·
80:·
73:·
66:·
39:.
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