What is a watch glass used for?

Answer 1

A watchglass can be used as a beaker cover, but you can also place small amounts of chemicals on it and then heat it (for example, to evaporate some water from a wet chemical).

From Wikipedia:

A watch glass is a circular, slightly concave piece of glass used in chemistry as a surface to evaporate a liquid, or as a cover for a beaker. The latter use is generally applied to prevent dust or other particles entering the beaker; the watch glass does not completely seal the beaker, and so gas exchanges still occur. When used as an evaporation surface, a watch glass allows closer observation of precipitates or crystallisation, and can be placed on a surface of contrasting colour to improve the visibility overall. Watch glasses are so named because they are identical to the glass used for the front of old-fashioned pocket watches. In reference to this, large watch glasses are occasionally known as clock glasses.

See the Related Questions and Web Links to the left for a picture of watch glass and more information about other laboratory apparatus.

Answer 2

You are probably referring to a watch glass. A watch glass is a small round glass plate that chemicals are put on to crystallize. It allows for easy viewing of the crystals.

A watch glass is also used as support for weighing samples.

Answer 3

Watch glass is a laboratory apparatus which is usually used in the lab. Watch glasses are also sometimes used to cover a glass of whisk, to concentrate the aromas in the glass, and to prevent spills when the whisky is swirled.

Watch glasses are so named because they are similar to the glass used for the front of old-fashioned pocket watches. In reference to this, large watch glasses are occasionally known as clock glasses.

Answer 4

A Watch Glass is used to look closer to things, like a magnifying glass, and it allows you to see microscopic things.

Answer 5

The watch glass use is to evaporate chemical solutions, just like the evaporating dish.
It acts as a magnifying glass

Answer 6

Watch glass uses:
- to cover a beaker
- to put a sample for weighing
- to perform a chemical reaction with small amounts of material

Answer 7

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