An evaporating dish is a piece of laboratory-glasswareused for the evaporationof solids and supernatant fluidsevaporating-dish, 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 of porcelainor borosilicate-glass. Shallow glass evaporating dishes are commonly termed "watch glasses", from their original use as the front window of a pocket-watch-2.evaporating-dishSome 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-abbreviation. 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 siliconcontent 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.
A generic evaporator
The shape of the evaporating dish encourages evaporation in two ways:
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-chemistryand violent ebullition.
-Jobelle Flores Pelagio
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An evaporating dish is typically connected to a heating source like a Bunsen burner or a hot plate in a laboratory setting. This connection allows for the controlled evaporation of a liquid from the dish, leaving behind any solid residue.
You would use "on the plate" when referring to placing something on top of a plate. For example, "The steak is on the plate." If referring to containing something inside a plate, you could use "in the plate," but it's less common.
To evaporate a solution using an evaporating dish, simply pour the solution into the dish and place it in a well-ventilated area. The liquid will slowly evaporate, leaving behind the solute as residue in the dish. You can also speed up the process by gently heating the dish from below with a hot plate or Bunsen burner.
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Yes, an evaporating dish can be heated on a hot plate to facilitate the evaporation of a solution. However, it is important to control the temperature to avoid overheating or damaging the dish. use a heat-resistant container if heating directly on the hot plate.
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An evaporating dish is typically connected to a heating source like a Bunsen burner or a hot plate in a laboratory setting. This connection allows for the controlled evaporation of a liquid from the dish, leaving behind any solid residue.
You would use "on the plate" when referring to placing something on top of a plate. For example, "The steak is on the plate." If referring to containing something inside a plate, you could use "in the plate," but it's less common.
Evaporating dishes are usually made of glass or porcelain which can crack or shatter when heated unevenly. Directly heating the dish over a Bunsen burner can cause temperature gradients within the dish leading to uneven heating and potential breakage. It is safer to use a hot plate or a water bath for more uniform heating.
The little white one? It's called an evaporating dish that you put your items and water in and let it evaporate over the Bunsen burner.
luminous flame gives partial combustion so you can see some black unburnt vapours deposited on the plate
to increase the surface area of evaporation
The name is clear: it is used to evaporate a liquid to obtain the solid residue.
no, it is more safe to use water bath :)
A yellow no plate of a car is indicate that the car is use as a taxi but a white no plate is stand that it is use for personal use.
In a given liquid, the atoms or molecules which are moving the fastest, and hence have the highest temperature, are the ones that are most likely to leave the liquid and evaporate. The atoms or molecules that they leave behind will therefore be cooler. Examples: evaporating water evaporating alcohol evaporating liquid nitrogen evaporating glycerol evaporating liquid helium evaporating acetone.