The shape, purpose and usage of watch glass
【Modeling】Arc-shaped glass dish with smooth edges and chamfered corners.
【How to use】Wash and dry the watch glass before use. The lab watch glass has a wide range of uses, but no matter what kind of instrument is used instead, it must be used according to the method of use of various instruments. For example, for gas cell identification, attach two watch glasses, using a ground synthetic gas chamber, and a piece of test paper soaked with reagents on the upper watch glass lab, and place the compound to be identified on the lower piece. On the watch glass, heat if necessary, observe the gas generated in the reaction, and identify the gas from the color change of the reagent. If you observe white precipitates or turbidity, you can put a piece of black paper on the bottom wall of the lab watch glass, and the white product can be clearly seen. If you make various instrument covers, you only need to use its arc to place it on the instrument port and keep it stable, but pay attention to select the watch glass lab according to the diameter of the instrument. Generally, the diameter of the watch glass should be larger than the diameter of the instrument by 1cm, which is more convenient to use. For beaker lids, use watch glass with different diameters according to the beaker capacity.
【Usage】It is produced with hard glass, which is suitable for quantitative analysis in the laboratory. For example, in biochemical analysis, two watch dishes are used to synthesize a culture chamber for suspension drop culture experiments. The gas chamber reaction was observed to observe white precipitation, trace dissolution, evaporation, etc.
The watch glass can be used as the cover of beakers, evaporating dishes, crystallizing dishes, funnels and other instruments to prevent dust from falling in and keep the material pure during operation. In the sublimation operation, it is used to prevent the dissimilation of the material, so that the dissimilated material stays at the bottom of the watch glass. When weighing corrosive substances, it can be used instead of the weighing pan of the balance.
Post time: Mar-04-2022
