How to choose chemical instruments, and what are the chemical instruments?

In terms of accuracy, burette = pipette beaker graduated cylinder.

The beaker is mainly used to hold the approximate volume of the solution, mainly to carry the volume, not to measure the volume.

The two buckets are simple to use, so they are used for measuring solutions that do not require high accuracy.

Burettes and pipettes measure solutions with high accuracy, but pipettes are generally quantitative solutions unless they are graduated by themselves, such as 25ml pipettes can only pipette 25ml of solution, and burettes can measure any of the solutions mentioned below the maximum scale, such as 50ml pipettes can get 10ml of solution.

The burette is mainly a measuring instrument used to accurately measure the liquid during titration, and the scale increases from top to bottom, which is the opposite of the graduated cylinder scale.

Pipettes are used to accurately measure small amounts of liquid. Burettes and pipettes are commonly used in quantitative analysis experiments.

Graduated cylinders can only be used to measure liquids that are not very precise in volume.

Beakers are often used to prepare solutions and as reaction vessels for larger quantities of reagents, which can generally be heated, and should generally be heated evenly when heating, and it is best not to dry burn. Only a rough estimate of the volume of the solution is possible.

When carrying out volume analysis, burettes are used, that is, the analysis of content, and burettes are relatively precise instruments.

Pipettes are also more commonly used, usually used when pipetting the exact volume of liquid, beakers are of course more commonly used, dissolved and reacted will be used, graduated cylinders can measure less accurate volume, the error is relatively large,

The chemical instruments are:

Thermometers, tray balances, test tubes, beakers, flasks, distillation flasks, Erlenmeyer flasks, funnels, jars, fine-mouthed flasks, burning spoons, evaporation dishes, alcohol lamps, Bunsen burners, graduated cylinders, gas collectors, droppers, dropper bottles, curved neck flasks, surface dishes, asbestos nets, glass rods, iron frames, burettes, mud triangles.

Classification:

1.It can be roughly divided into instruments used for measurement, instruments used for reactions, instruments used to store medicines, instruments used for fixed connections, instruments used to provide heat sources, etc.

2.According to the different production materials, it is divided:

It can be roughly divided into glass instruments, porcelain instruments, metal instruments, wooden instruments, plastic instruments and rubber instruments.

Introduction of the funnel:

Normal: The funnel is a cylindrical object of celery silver, which is used to pour liquids and fine powdery objects into smaller containers with a smaller entrance. Town feast.

The finer tubular part at the nozzle of the funnel can be of different lengths. Funnels are usually made of stainless steel or plastic, but paper funnels are sometimes used for substances that are difficult to clean thoroughly, such as engine oil. Some funnels are equipped with a controllable flap at the nozzle to allow the user to control the velocity of the fluid inflow.

Filter paper is sometimes used to isolate chemicals such as crystals.

Dispensing type: a glass laboratory utensils, especially involving a separating funnel for chemical experiments.

Including the bucket body, the bucket lid that covers the upper mouth of the bucket body. The lower mouth of the bucket body is provided with a piston of a three-way structure, and the two crosses of the piston are connected with two downpipes respectively. Using the utility model, can make the experimental operation process conducive to control, reduce labor intensity, when the amount of liquid that needs to be separated is large, only need to move the tee of piston can flow to the lower tube at the same time two kinds of liquid in the bucket body, can be completed at one time without replacing the container.

Long neck type: a kind of funnel, mainly used to add liquid drugs when solids and liquids react in Erlenmeyer flasks. Generally, it can also be replaced with a separating funnel.

When using, pay attention to the bottom of the funnel below the liquid level, this is to prevent the generated gas from escaping from the mouth of the long-neck funnel and acting as a liquid seal. Long-necked funnels are used in laboratory experiments such as carbon dioxide and oxygen. Notes:

After the test, it should be cleaned to avoid drug residues that may cause deviation in the next experiment.

Is your question too broad? Which one do you ask?

It can only be used in a specific category of instruments, because different instruments have different rules for use.

Common instruments in chemical laboratories: test tubes, beakers, glass rods, droppers, dropper bottles, fine-mouth bottles, jars, graduated cylinders, funnels, long-neck funnels, separating funnels, Erlenmeyer flasks, round and flat-bottomed flasks, condenser tubes, volumetric flasks, stool funnel gas collection cylinders.

Heating instruments: alcohol lamps, alcohol blowtorches, others: asbestos nets, iron stands, rubber stoppers, catheters, medicine spoons, paper troughs, balances, test tube racks, pH test papers, evaporation dishes, filter papers, crucibles, tripods, crucible pliers, test tube clamps, test tube brushes, burning spoons, surface dishes.

Precautions for common instruments in chemical experiments.

The jujube can be directly heated and clamped in the middle and upper part of the test tube with a test tube clamp.

The liquid in the test tube does not exceed 1 2 of the volume of the test tube when it is not heated, and does not exceed 1 3 when heated.

Do not quench after heating to prevent explosion.

The mouth of the test tube should not be directed at anyone when heating.

When heating the solids, the mouth of the test tube is slightly inclined downward.

When heating the liquid, the tube is at a 45° angle to the tabletop.

Summary. Dear, I'm glad to answer for you, chemical instruments are instruments used in chemical experiments called chemical instruments. The material can be measured or reacted to.

It is mainly divided into measuring instruments and reaction instruments. The instruments are combined in a specific way to form a device to achieve the purpose of the experiment. Commonly used chemical instruments are divided into two categories: simple instruments and complex instruments.

Dear, I'm glad to answer for you, chemical instruments are instruments used in chemical experiments called chemical instruments. The material can be measured or reacted to. It is mainly divided into measuring instruments and reaction instruments.

The instruments are combined in a specific way to form a device to achieve the purpose of the experiment. Commonly used chemical instruments are divided into two categories: simple instruments and complex instruments.

I would like to know what the chemical instruments in ** are?

Good. k evaporation dish. I Brown SE Dropper Bottle N Glass Surface Dish G Distillation Flask J Friction Tamper L Desiccant O Graduated Cylinder, Volumetric Flask.

What is M?

Three-puff flask.

Categories: Education Science >> Entrance Examination >>.

Analysis: Test tubes, test tube clamps, iron racks, flasks, glass rods, distillation flasks, beakers, Erlenmeyer flasks, burning spoons, medicine spoons, alcohol lamps, asbestos nets, alcohol blowtorches, balances (with weights), measuring cylinders, volumetric flasks, acid burettes, alkaline burettes, thermometers, evaporation dishes, surface dishes, crucibles, funnels, long neck funnels, separating funnels, spherical funnels, washing cylinders, drying tubes, U-shaped tubes, condenser tubes, gas collection cylinders, Qipu generators, wide-mouth bottles, fine-mouth bottles, dropper bottles, rubber head droppers.