CHEMISTRY GLOSSARY
Buchner flask → Buchnerova tikvica
Büchner flask (also known as a vacuum flask, filter flask, side-arm flask or Kitasato flask) is a thick-walled Erlenmeyer flask with a side arm to which a vacuum can be applied.
vacuum distillation → vakuum destilacija
Vacuum distillation is distillation under reduced pressure. The depression in the boiling point of the substance distilled means that the temperature is lower, which may prevent the substance from decomposing.
Erlenmeyer flask → Erlenmeyerova tikvica
Erlenmeyer flask is a glass container which has a narrow, cylindrical mouth and a cone-shaped main body that ends in a wide, flat bottom. It was named after its inventor, a German chemist Richard Erlenmeyer (1825-1909). Erlenmeyer flasks are most often used in titrations to hold the liquid that is being titrated.
Kjeldahl flask → Kjeldahlova tikvica
Kjeldahl flask is a round bottom flask with a long wide neck that is used in the determination of nitrogen by Kjeldahl’s method. The method was developed by the Danish chemist Johan Kjeldahl (1849-1900).
vacuum filtration → vakuum filtracija
Vacuum filtration is a technique for separating a solid product from a liquid. The mixture of solid and liquid is poured through a filter paper in a Buchner funnel. The solid is trapped by the filter and the liquid is drawn through the funnel into the flask below, by a vacuum.
volumetric flask → odmjerna tikvica
Volumetric flasks are bottles made of glass, in a pear like in shape with long thin necks and flat bottoms. All come with a ground glass stopper for a tight seal. Volume marking is cut in glass with fluoride acid around the neck, so that parallax should be avoided (flask is put in front of the eyes so that one can see only a straight horizontal line). A volumetric flask is calibrated to contain (TC or In) the indicated volume of water at 20 °C when the bottom of the meniscus is adjusted to just rest on the center of the line marked on the neck of the flask. They are used for preparing the exactly known volume of sample solution and standard solutions of reagents. On each flask with volume designation a temperature on which the flask has been calibrated is designated.
filter flask → boca za odsisavanje
Filter flask, also known as a vacuum flask, is a flask with a side arm to which a vacuum can be applied. It usually have heavy side walls to withstand high vacuum.
Soxhlet extractor → Soxhletov ekstraktor
Soxhlet extractor is a laboratory apparatus designed to extract substances with a low solubility in the extracting solvent. The method described by the German chemist Franz von Soxhlet (1848-1926) in 1879 is the most commonly used example of a semi-continuous method applied to extraction of lipids from foods. In the Soxhlet extractor, the sample soaks in hot solvent that is periodically siphoned off, distilled and returned to the sample. During each cycle, a portion of the non-volatile compound dissolves in the solvent. After many cycles the desired compound is concentrated in the distillation flask. The solvent in the flask is then evaporated and the mass of the remaining lipid is measured.
Citing this page:
Generalic, Eni. "Vakuum tikvica." Croatian-English Chemistry Dictionary & Glossary. 29 June 2022. KTF-Split. {Date of access}. <https://glossary.periodni.com>.
English
