Used to Carry Out Chemical Reactions Because It Is Shaped Like a Cone and Can Be Stoppered.

Laboratory flasks are vessels or containers that fall into the category of laboratory equipment known as glassware. In laboratory and other scientific settings, they are usually referred to only as flasks. Flasks come in a number of shapes and a wide range of sizes, merely a common distinguishing aspect in their shapes is a wider vessel "body" and one (or sometimes more) narrower tubular sections at the height called necks which take an opening at the peak. Laboratory flask sizes are specified by the volume they can hold, typically in metric units such every bit milliliters (mL or ml) or liters (Fifty or fifty). Laboratory flasks have traditionally been made of drinking glass, but tin can also be fabricated of plastic.

At the opening(southward) at top of the cervix of some glass flasks such equally round-bottom flasks, retorts, or sometimes volumetric flasks, there are outer (or female person) tapered (conical) ground glass joints. Some flasks, specially volumetric flasks, come with a laboratory rubber stopper, bung, or cap for capping the opening at the elevation of the neck. Such stoppers can exist made of glass or plastic. Glass stoppers typically have a matching tapered inner (or male) ground glass articulation surface, merely frequently simply of stopper quality. Flasks which do not come up with such stoppers or caps included may be capped with a rubber hurl or cork stopper.

Flasks tin be used for making solutions or for property, containing, collecting, or sometimes volumetrically measuring chemicals, samples, solutions, etc. for chemical reactions or other processes such as mixing, heating, cooling, dissolving, precipitation, boiling (as in distillation), or assay.

List of flasks [edit]

There are several types of laboratory flasks, all of which have different functions within the laboratory. Flasks, because of their use, can be divided into:

• Reaction flasks, which are usually spherical (i.e. round-bottom flask) and are accompanied past 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 tin tolerate large force per unit area differences, with the result that one can be kept both in a reaction nether vacuum, and pressure, sometimes simultaneously. Some varieties are:
  • Multiple cervix flasks, which can have two to five, and less usually, six necks, each topped by ground glass connections which are used in more complex reactions that crave the controlled mixing of multiple reagents.
  • Schlenk flask, which is a spherical flask with a basis 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.

• Distillation flasks are intended to contain mixtures that are subject field to distillation, as well as to receive the products of distillation. Distillation flasks are available in various shapes. Similar to the reaction flasks, the distillation flasks normally accept only ane narrow neck and a basis glass joint and are made of thinner drinking glass than the reaction flask, so that they are easier to heat. They are sometimes spherical, exam tube shaped or pear-shaped, also known as Kjeldahl Flasks, due to their utilize with Kjeldahl bulbs.
• Reagent flasks are usually flat-bottomed flasks, which can thus exist conveniently placed on the tabular array or in a cabinet. These flasks cannot withstand besides much pressure or temperature differences, due to the stresses which arise in a flat bottom; these flasks are usually made of weaker drinking glass than reaction flasks. Certain types of flasks are supplied with a ground glass stopper in them, and others that have threaded necks close with an appropriate nut or automated dispenser. These flasks are available in two standard shapes:
• Round-bottom flasks are shaped like a tube emerging from the top of a sphere. The flasks are often long neck; sometimes they have the incision on the neck, which precisely defines the volume of flask. They tin be used in distillations, or in the heating a product. These types of flask are alternatively called Florence flasks.
• Flasks with flat lesser.
• Cassia flasks, for the assay of essential oils and aldehyde determination, approx. 100 ml, neck graduated 0 - 6 : 0,1 ml.
• Erlenmeyer flask [introduced in 1861 by German chemist Emil Erlenmeyer (1825–1909)] - is shaped like a cone, usually completed past the ground joint, the conical flasks are very popular because of their depression price (they are easy to manufacture) and portability
• Volumetric flask is used for preparing liquids with volumes of high precision. Information technology is a flask with an approximately pear-shaped body and a long cervix with a circumferential fill line.
• Dewar flask is a double-walled flask having a about-vacuum between the two walls. These come in a multifariousness of shapes and sizes; some are large and tube-similar, others are shaped like regular flasks.
• Evaporating flasks (for rotary evaporator) centered, pear shaped, with socket or with flange.
• Powder flasks, for drying of powdered substances, pear shaped, with socket
• 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 apartment-bottomed flask, only made of very thick and resistant glass. They are ordinarily a cone shape - like to the shape of an Erlenmeyer flask, only besides have side neck, ordinarily affixed to the side, two / 3 up from the lesser. The flasks are used to cooperate with vacuum aspirator or vacuum pumps in the vacuum filtration, or every bit additional security during the distillation and other processes carried out nether reduced pressure.
• Culture flasks for growing cells are designed to better aeration by including baffles that aid in mixing when placed on a shaker table.
• Chalice (glassware)

Many of these flasks tin can be wrapped in a protective outer layer of glass, leaving a gap betwixt the inner and outer walls. These are chosen jacketed flasks; they are oftentimes used in a reaction using a cooling fluid.

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  Round-bottom flask — a flask with a spherical body and ane or more necks with ground glass joints.

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  Antiphon — a spherical vessel with a long downward-pointing neck.

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  Florence flask — a flask with a round body and one longer neck without a ground glass joint.

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  Büchner flask or sidearm flask — a thick-walled conical flask with a curt hose-connection tube on the side of the neck.

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  Volumetric flask — for preparing liquids with volumes of high precision. It is a flask with an approximately pear-shaped body and a long cervix with a circumferential fill up line.

• 

  Dewar flask — a double-walled flask having a near-vacuum between the two walls.

Legal bug [edit]

Like many other mutual pieces of glassware, Erlenmeyer flasks could potentially be used in the production of drugs. In an effort to reduce their proliferation past theft from teaching institutions where they are commonly stored, some U.S. states (including Texas) have requirements to inspect and study unusual inventory discrepancies (not from wear or breakage). Reporting requirements likewise cover chemicals identified equally common starting materials.^[1]

References [edit]

1. ^ "Memorandum of Agreement betwixt the Texas Department of Public Safety and the Texas College Education Analogous Board" (PDF). 080107 thecb.country.tx.us

External links [edit]

Media related to Laboratory flasks at Wikimedia Eatables

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Source: https://en.wikipedia.org/wiki/Laboratory_flask

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