What is the difference between erlenmeyer flask and volumetric flask

Their shape allows recovery of more material than the round-bottomed flasks. The rather odd-looking retort flasks are used in distillations, though their use was primarily before the advent of condensers. Today, they are very rarely used. The Schlenk flask and the Straus flask are another two that look fairly similar.

Schlenk flasks are commonly used in air-sensitive chemistry, as the side arm allows an inert gas such as nitrogen to be pumped into the vessel. The Straus flask, on the other hand, is used to store dried solvents. The main neck is actually filled in halfway up, and connected to a plugged smaller neck; this main neck can be connected to other apparatus, and allows the solvent to be extracted when the plug is slightly withdrawn or removed entirely.

Finally, the Claisen flask , designed by chemist Ludwig Claisen, is designed for vacuum distillation; distillation under vacuum produces problematic amounts of bubbles when solutions are boiled.

A variety of different apparatus can be used for filtration. The most obvious is the filter funnel , into which filter paper can be placed, and a mixture can then be poured through. The smaller thistle funnel is not used for filtering at all, but to add liquids into apparatus. The Buchner flask can be used in conjunction with a Buchner funnel in vacuum filtration, and is a much quicker process than the gravity filtration used with normal filter funnels.

For separating solutions or liquids of different densities, separating funnels can be used. Liquids of a lower density will float to the top, then the mixtures can be tapped off separately. The similar-looking dropping funnel is used to add liquids or solutions to a reaction. Another method of separating mixtures of compounds is column chromatography, which can be carried out using a chromatography column.

The mixture is passed through a column of silicon dioxide or aluminium oxide, with different components of the mixture taking differing amounts of time to pass through the column. Finally, the Thiele tube is a piece of apparatus used to determine the melting point of a solid compound. It contains and heats an oil bath, into which a sample can be placed along with a thermometer. Heating then allows melting point to be determined.

The design of the flask allows the oil to circulate, ensuring even heating. A range of different condensers can be utilised in laboratories as important components of distillation apparatus.

The Graham condenser is similar to this, but has a coiled path for the vapour to flow through and condense. Because they are so often used for boiling, Florence flasks are produced with borosilicate glass to prevent cracking. A retort is a type of flask used primarily for distillation and its design is exclusive to this purpose. The retort resembles an exaggerated teardrop with the middle bent at almost a 90 degree angle. The bulb portion contains a liquid or chemical solution, which is heated to the point of condensation.

The condensation then attaches to the roof of the retort, and as it begins precipitating, it runs down the angle of the long, thin point of the tear where there is another opening. The liquid collects in a separate container. A Schlenk flask can be a round, pear-shaped or tubular bulb that stretches vertically into a long, thin neck with a side-arm.

The side arm features a valve so that pressure or gas can be released from the flask. Volumetric flasks are flasks used to measure specific volumes of material. They are generally graduated with metric markings to measure the volume of material in the container.

They are typically composed of a round or pear-shaped bulb and a long thin neck topped by a stopper or rubber bung. Because the volumetric flask function is to generally be used for measurement or reactions and not heating or boiling, they can be made of plastic or glass. May 30, May 20, Powered by Shopify.

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