How do I use a beaker? How to use the beaker A brief introduction to how to use the beaker

Beaker Usage:

Contains reactants.

How to use: The beaker is the most commonly used reaction vessel for simple chemical reactions because of its consistent caliber, which is very convenient for 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 identification. 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 can flow smoothly down the rod.

Main uses: 1) Reactor of substances, determination of combustion products.

2) Dissolve and crystallize a substance.

3) Contain, evaporate, concentrate or heat the solution.

Precautions for use:

1) The injected liquid does not exceed 2 3 of its volume

2) Use asbestos mesh when heating.

3) The outside of the beaker should be wiped dry before heating.

4) Tips: * The beaker should not be suitable for holding a large number of reactants, because the beaker mouth is large, 50ml of acid. Alkali and other reactants are together and are easy to splash out It is better to use a flask! * The flame can't touch the scale!

Heating the liquid, or letting it react, can not be heated directly, to use asbestos netting, to prevent uneven heating.

1) Beaker Main use: Used as a container for dissolving solid substances and diluting liquids.

It is used as a vessel for reactions with larger amounts of reagents.

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.

A cold, dry beaker can be used to test whether water is formed during gas combustion; A beaker coated with clarified lime water can be used to test the gas.

How to use and precautions: Commonly used specifications are 50ml, 100ml, 250ml, etc., but do not use a beaker to measure the liquid.

It should be placed on an asbestos net to heat it evenly; When heated, the outer wall of the beaker should be free of water droplets.

When the liquid is heated, do not exceed the beaker volume, and generally the beaker volume is appropriate.

During dissolution or dilution, stir with a glass rod without touching the bottom or walls of the cup.

No, you can't add asbestos netting.

Question 1: What are the beakers are sold in The material is generally polyethylene, and the special ones are polytetrafluoroethylene.

Question 2: What is the material of the chemical instrument beaker is glass?

The chemical composition of ordinary glass is Na2O Cao 6SiO2 and the main component is silicon dioxide.

Question 3: What is the material of plastic beakers Generally polyethylene, special PTFE.

Question 4: What material is the beaker and test tube used in the laboratory made of? It's just ordinary glass problem five:

What is the main material of chemical instruments such as test tube beakers and flasks Glass question 6: Is the commonly used material of beakers fused silica or fused silica Quartz ceramics are an acid refractory material made by using fused silica as raw material and the production process of ordinary ceramics as the method. The silica content of this material is as high as more than 99%, and it can be made into a variety of special-shaped products and large-format products.

Most of its properties are close to fused silica, and individual properties are better than fused silica. Its firing temperature is only 1 2 0 0 , and only a small amount reaches the porcelain level. On the whole, it belongs to the sintered material, which is pottery and not porcelain.

Fused silica and quartz ceramics are not the same, fused silica is a collective term, which includes all quartz glass (except for synthetic ones). It is a kind of supercooled Biqing liquid made of natural quartz, including silica and crystal, which is melted at high temperature. It also has a minimum SI O2 content of 99%.

The small beaker in a large beaker can make the water in the small beaker boil, but certain conditions need to be met.

First, let's take a look at the conditions required for water to boil. Two conditions are required for water to boil: first, the temperature of the water reaches the boiling point, which is usually 100 degrees Celsius; The second is that water needs to absorb heat continuously. When these two conditions are met at the same time, the water boils.

By placing a small beaker in a large beaker, the water in the large beaker can be used as a heat source to heat the water in the small beaker. When the water in the large beaker of the Qing family boils, the water in the small beaker also reaches the boiling point, but since there is a temperature difference between the water in the small beaker and the water in the large beaker, there will be heat transfer between them.

However, due to the large beaker with a large contact area between water and air, it can absorb much more chaotic heat from the surrounding environment, thus keeping the temperature at the boiling point. The water in the small beaker is at the same temperature as the water in the large beaker, so there is no heat transfer between them, and the water in the small beaker cannot continue to absorb heat. Therefore, although the water in the small beaker reaches its boiling point, it cannot boil because it cannot continue to absorb heat.

If you want to boil the water in a small beaker, here are a few ways to consider:

1.Increase the heat source: The energy of the heat source can be increased, for example by using a more powerful heating device or by increasing the amount of fuel burned, so that the water in the large beaker is continuously heated, so as to provide enough heat to the water in the small beaker.

2.Changing the ambient temperature: The temperature difference between the large beaker and the small beaker can be affected by varying the ambient temperature.

For example, in a cold environment, the temperature of the water in the large beaker may be below the boiling point, so that the water in the small beaker can absorb heat from the large beaker and thus boil.

3.Increase stirring: The rate of heat transfer can be increased by stirring the water between the large beaker and the small beaker. This allows the water in the small beaker to absorb heat more quickly, making it easier to boil.

In general, the small beaker in a large beaker can be put to boil the water in the small beaker, but certain conditions need to be met. If you want to boil the water in the small beaker, you need to provide enough heat to the water in the small beaker, or change the ambient temperature or increase the stirring to promote the heat transfer.

It is definitely not oak dust that can boil, and water boiling needs to meet 2 conditions.

1.The temperature reaches Celsius.

100°c2.This base continues to absorb heat on the basis of the head.

Large beaker. Water can boil because it reaches 100°C and there is a heating device to heat it.

The water of the small beaker, because it is in the water of the large beaker, is also 100°C, but it cannot continue to absorb heat, because the water of the large beaker is the same temperature as it, so there is no heat transfer.

Got it?

1. Beaker is a common laboratory glassware, 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 to facilitate pouring liquid. 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.

Commonly used specifications are 50ml, 100ml, 250ml, etc., but do not use a beaker to measure the liquid.

2. Heating: It should be heated on the asbestos net to make it evenly heated; When heated, the outer wall of the beaker should be free of water droplets. When the liquid is heated, do not exceed 2 3 of the beaker volume, and generally 1 2 of the beaker is appropriate.

When heating corrosive chemicals, a dish can be placed on the beaker to prevent the liquid from spilling.

3. Stirring: During the process of dissolving or dilution, do not touch the bottom or wall of the cup when stirring with a glass rod.