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- Evaporating_dish abstract "An evaporating dish is a piece of laboratory glassware used for the evaporation of solutions and supernatant liquids, and sometimes to their melting point. Evaporating dishes are used to evaporate excess solvents - most commonly water - to produce a concentrated solution or a solid precipitate of the dissolved substance.Most are made of porcelain or borosilicate glass. Shallow glass evaporating dishes are commonly termed "watch glasses", since they resemble the front window of a pocket watch. Some used for high-temperature work are of refractory metals, usually of platinum, owing to its non-reactive behaviour and low risk of contamination.The capacity of evaporators is usually small - in the range 3-10 ml. Larger dishes, up to 100 ml, are different in shape, and are more hemispherical.The evaporator is used most often in quantitative analysis.In the determination of silicon content in an organic sample, a small and accurately-measured quantity of a substance is added to the large amount of sulfuric acid, then heated in an evaporating dish. The dish is heated with a Bunsen burner, until only stable precipitate remains, which contains the silica content. The dish is then closed and heated at high temperature until completely clean, fused silica is produced. Comparison of the initial weight of the substance and that of the fused silica allows to the content of silicon in the sample to be determined.The shape of the evaporating dish encourages evaporation in two ways: The shell is relatively flat. A relatively large liquid surface promotes evaporation. If heated in a flask or beaker, a part of the evaporated liquid condenses on the vessel walls and flows back into the solution. This does not happen in a dish.When heating liquid in an evaporating dish, the low walls encourage splashes and so stirring or swirling of evaporating liquids is considered bad practice, owing to the risk of spillage.Evaporation in a laboratory, especially in production quantities rather than merely for analysis, is now mostly performed in a rotary evaporator. This is preferred because it works much faster and may be used under vacuum, avoiding unwanted reactions with the atmosphere and allowing control of noxious fumes. Evaporation under vacuum also reduces the severity of bumping and violent ebullition.".
- Evaporating_dish thumbnail Abdampfschalen_verschiedene_Groessen.jpg?width=300.
- Evaporating_dish wikiPageID "28303296".
- Evaporating_dish wikiPageRevisionID "599038105".
- Evaporating_dish caption "Three evaporation dishes in various sizes".
- Evaporating_dish hasPhotoCollection Evaporating_dish.
- Evaporating_dish name "Evaporating dish".
- Evaporating_dish otherNames "Evaporating basin".
- Evaporating_dish related Crucible.
- Evaporating_dish uses "Evaporation of solids and supernatant fluids".
- Evaporating_dish subject Category:Laboratory_glassware.
- Evaporating_dish subject Category:Laboratory_porcelainware.
- Evaporating_dish comment "An evaporating dish is a piece of laboratory glassware used for the evaporation of solutions and supernatant liquids, and sometimes to their melting point. Evaporating dishes are used to evaporate excess solvents - most commonly water - to produce a concentrated solution or a solid precipitate of the dissolved substance.Most are made of porcelain or borosilicate glass. Shallow glass evaporating dishes are commonly termed "watch glasses", since they resemble the front window of a pocket watch.".
- Evaporating_dish label "Evaporating dish".
- Evaporating_dish label "蒸發皿".
- Evaporating_dish sameAs 증발접시.
- Evaporating_dish sameAs m.0cn_7vt.
- Evaporating_dish sameAs Q5416060.
- Evaporating_dish sameAs Q5416060.
- Evaporating_dish wasDerivedFrom Evaporating_dish?oldid=599038105.
- Evaporating_dish depiction Abdampfschalen_verschiedene_Groessen.jpg.
- Evaporating_dish isPrimaryTopicOf Evaporating_dish.