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Anonymous users2024-02-11Beaker. How to use and precautions:
1. Commonly used specifications are 50ml, 100ml, 250ml, etc., but do not use a beaker to measure the liquid.
2. It should be placed in the asbestos net.
on the heating so that it is evenly heated; When heated, the outer wall of the beaker should be free of water droplets.
3. When the liquid is heated, do not exceed 2 3 of the beaker volume, and 1 2 of the beaker volume is generally appropriate.
4. During the dissolution or dilution process, do not touch the bottom or wall of the cup when stirring with a glass rod.
5. When heating corrosive drugs, a surface dish can be covered on the mouth of the beaker to avoid the liquid from splashing.
A beaker is a common type of laboratory glassware that is usually made of glass, plastic, or heat-resistant glass. The beaker is cylindrical in shape and has a notch on one side of the top for easy pouring of liquids.
Some beakers are also marked with a scale on the outer wall, which allows a rough estimate of the volume of liquid in the beaker.
Extended Materials. The main uses of beakers are:
1. It is used as a container for dissolving solid substances and diluting liquids.
2. It is used as a container for a large amount of reagents to react.
3. It is used for filtration, dialysis, fountain and other experiments, and is used for air tightness inspection, exhaust gas absorption device, water bath heating, etc.
4. A cold dry beaker can be used to test whether there is water generation in gas combustion; Coated with clarified lime water. Beaker.
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Anonymous users2024-02-101. How to use the beaker: The beaker is the most commonly used reaction vessel for simple chemical reactions because of its consistent caliber and the convenience of taking liquids. When the outer wall of the beaker is scaled, the volume of solution inside the beaker can be estimated.
Some beakers also have a small patch on the outer wall that is white or burr, and the name of the contents can be written in pencil in this area. If there is no such area on the beaker, the name of the contents can be written on the label paper and then affixed to the outer wall of the beaker for the purpose of discrediting the beaker. When the reactants need to be stirred, they are usually stirred with a glass rod.
When the solution needs to be moved to another container, the cup can be tilted towards the side with a protruding notch, and the solution can be poured out smoothly. To prevent the solution from flowing down the outside of the cup wall, you can use a glass rod to touch the rim of the cup, and the solution attached to the rim of the cup will flow smoothly down the rod.
2. Attention should be paid to the use of beakers:
1) When heating the beaker, put an asbestos net. The beaker cannot be heated directly with a flame. Because the bottom surface of the beaker is large, it can only be burned to a part by direct heating with a flame, which causes the glass to burst due to uneven heating.
2) When heating the liquid with a beaker, the amount of liquid should not exceed 1 3 of the beaker volume to prevent the liquid from overflowing during boiling. When heating, the outer wall of the beaker must be wiped dry.
3) When heating corrosive drugs, a surface dish can be covered on the mouth of the beaker to avoid the liquid from splashing.
4) Do not use a beaker to hold chemicals for a long time, so as not to fall into dust and evaporate the water in the solution.
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Anonymous users2024-02-09Beaker Uses: A beaker is a common laboratory glassware that is cylindrical in shape and has a notch on one side of the top for easy pouring of liquids. Its main uses are:
1. Used as a reactor for substances;
2. Dissolve and crystallize a substance;
3. Containing, evaporating, concentrating or heating solutions;
4. Hold corrosive solid drugs for weighing.
Expand] beaker specifications are 5 ml, 10 ml, 25 ml, 50 ml, 100 ml, 250 ml, 500 ml and so on. When using a beaker, pay attention to the fact that when heating the beaker, an asbestos net should be padded to provide uniform heating.
The beaker should not be heated directly to avoid uneven heat that could cause explosions. When used for dissolution, the amount of liquid should not exceed 1 3 of the beaker volume and stir gently and constantly with a glass rod.
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