Graduated Beaker

Beakers are one of the laboratory's most commonly used glass instruments and one of the simplest consumables to use. Beaker with a scale is called a graduated beaker. Graduated beakers are also a common type of laboratory glassware. Beakers are cylindrical with a slot on the top side for easy pouring of liquids. Beakers are widely used for heating, dissolving, mixing, boiling, melting, evaporating and concentrating, diluting, and precipitating chemical reagents.

Beakers can be made of different materials, such as glass, plastic, or heat-resistant glass. Generally, the beaker used in the laboratory is a glass product, but plastic beakers are also available on the market. Conventional glass is an amorphous solid that softens a little as the temperature rises. To put it bluntly, it will melt when heated. But a beaker is a glass product that can be burned (heated). In the laboratory, the temperature of glass beakers for routine experiments does not reach the melting point of the beakers.

There are four main types of graduated beakers (beakers), which are low beakers, high beakers, conical beakers, and stained beakers. The low type beaker is the most commonly used beaker, and the usual beaker also generally refers to the low type beaker.

The low form beaker is the most commonly used laboratory beaker, designed by the English chemist Griffin, hence the name low form Griffin beaker.

The height of a low form beaker is about 1.4 times its diameter and is used in most chemistry experiments. Beakers of different sizes are used for different purposes. Beakers with a volume of 1 to 50 mL are mainly used for microanalysis; beakers with a volume of 50 to 2000 mL are mainly used for constant analysis and as containers for general chemical reactions, or for the temporary storage of liquids; beakers with a volume of 3000 to 5000 mL are rarely used in general chemical experiments, and are mainly used in industrial production units as tools for small batch production or in laboratories as containers. Laboratory for containers, sometimes instead of water and electrolytic tank to use.

The specifications and reference sizes of low-type graduated beakers are listed below.

The specifications and reference sizes of the plastic beaker are listed below.

The tall beaker is approximately twice as tall as its diameter. Its unique thin and high shape prevents spills during heating or when dripping liquids from above, and can also be used for electrolysis instead of an electrolytic bath and occasionally for titration instead of a conical flask. Because the high beaker is smaller than the low beaker of the same height, it can be used to save reagents by reducing the number of reagents used in experiments.

The specifications and reference dimensions of the tall beakers are listed below.

The conical beaker is similar in shape to a conical flask, with a wide lower part and a narrow upper part to facilitate shaking and prevent spilling of liquid. It can be used to receive fractions during distillation at atmospheric pressure and to hold the liquid to be measured during titration.

The specifications and reference sizes of conical beakers are listed below.

The beaker dye pot has an overall conical shape with a wide top and a narrow bottom, but there is an abrupt widening in the middle and top.

The specifications and reference sizes of the dye beakers are listed below.

Not the same. First of all, the purpose is not the same. Measuring cups are graduated measuring instruments used to measure liquids and are also glass cups, while beakers are glass cups used for heating liquids. Measuring cups are not heat-resistant and cannot be used for heating. Beakers are heat resistant.

Beakers have no index value. Because a beaker is a container of liquid, not a glass instrument for measuring the volume of liquid, it has no index value. A graduated beaker has an approximate scale, but it only indicates approximately what the scale is.

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A graduated beaker is a container, not a measuring device. So don't use a beaker to measure the volume of a liquid or to take a fixed volume of liquid. Although it has a scale, that is only used to roughly estimate the amount, and should not be taken as accurate data.

A beaker is common laboratory glassware with the following main uses.

a. As a reactor for the substance to determine the combustion products.

b. Dissolve, and crystallize a substance.

c. Hold, evaporate, concentrate, or heat solutions.

d. Weighing of corrosive solids.

e. Beakers are the most common reaction vessels for simple chemical reactions because they have the same diameter at the top and bottom and are very convenient for accessing liquids. The volume of the solution inside the beaker can be estimated when the outside wall is marked. Some beakers may also have a small area on the outside wall that is white or in this area, a pencil can be written to describe the name of the contents.

If there is no such zone on the graduated beaker, the name of the contents can be written on a label and placed on the outside of the beaker for identification purposes. When the reaction needs to be stirred, it is usually stirred with a glass rod. When moving to another container, the solution can be removed smoothly by tilting the mouth of the beaker toward the side with the protruding notch. To prevent the solution from flowing down the outside of the cup, touch the mouth of the cup with a village glass rod and the solution attached to the mouth of the cup will flow smoothly down the rod.

There are several points that should be noted when using beakers.

a) Asbestos netting is a must. To be heated beaker to pad the asbestos net, in order to evenly supply heat. Cannot use the flame to directly heat the beaker, because the bottom of the beaker is large, direct heating with a flame, only to the local, so that the glass is unevenly heated and caused by frying. When heating, the outside of the beaker must be wiped dry.

b) When used for dissolution, the amount of liquid should not exceed 1/3 of the volume of the beaker, and stir gently with a glass rod continuously. During the dissolution or dilution, do not touch the bottom or wall of the beaker when stirring with the glass rod.

c) When heating the liquid, do not exceed 2/3 of the volume of the beaker, generally 1/3 of the volume of the beaker is appropriate.

d) When heating corrosive drugs, a surface dish can be covered on the mouth of the beaker, so as not to spill the liquid.

e) Do not use the beaker to hold chemicals for a long time, so as not to fall into the dust and make the water in the solution evaporate.

f) You cannot use a beaker to measure liquids.

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