Basic knowledge of preparation before scientific research experiments, and what preparations should

Safety knowledge, expertise.

What should be done before entering the laboratory:1. Clarify the purpose of the experiment;

2. Understand the experimental equipment of this experiment and operate Bi Shen's program;

3. Understand the use of experimental equipment;

4. Understand the places that should be paid attention to in this experimental operation and how to solve it;

5. Know the laboratory specifications.

Precautions for entering the chemistry lab:

1. Keep flammable and explosive drugs away from fire sources, and avoid sticking corrosive hand dispersed drugs on clothes or **.

2. Before entering the laboratory, the experimental tasks, steps and precautions should be clarified.

3. Before the experiment, check whether the supplies are complete; During the experiment, the experimental supplies should be placed neatly in order.

4. Do not touch the medicine with your hands, and do not put your nostrils to the mouth of the container to smell the smell of the medicine. It is strictly forbidden to taste medicines.

5. Wear goggles as much as possible when doing experiments; During the heating operation, do not approach the heated instrument for observation, and do not turn the mouth of the test tube towards others or yourself.

a.It is necessary to carefully preview and clarify the experimental ideas.

b.The instrument should be carefully inspected for damage, grasp the key points of correct use of the instrument, get the water, electricity, and gas pipeline switches and markings, keep a clear mind, and avoid illegal operations.

c.Understand the performance and possible hazards of the drugs used in the experiment and the corresponding precautions dAll of the above.

Answer: d

1.Sample handling.

The sample was crushed to 20 40 mesh, placed in acetone solvent, ultrasonic dust removal to remove surface dust, cleaned and dried in a drying box. Then weigh the use of the carry in the experiment.

2.Preparation of deionized water.

Deionized water is heated on an electric furnace and boiled for more than 30 minutes to remove gases from the deionized water.

3.Prepare content of NaCl solution.

1) The old calendar of NaCl crystals weighed by an electronic scale. The NaCl crystals used are analytically pure and the molecular weight is argumentative.

2) Use a graduated cylinder to accurately measure 7721ml of deionized water, add it to the weighed NaCl crystals, and stir well.

The chemical composition of the prepared NaCl solution was analyzed in Table 3-2.

Table 3-2 Chemical analysis results of Naci solution with experimental content.

1. When entering the laboratory, you must wear work clothes, don't leave anything to chance, if you accidentally touch the acid, it is a trivial matter for the clothes to burn a hole, and the burn will be troublesome. Don't be too troublesome, you must wear gloves before doing experiments that are harmful to your body, and you must be responsible for your own body.

2. Clean and wash your hands before and after the experiment, if you go to rest and drink water in the middle of the experiment, you should also wash your hands, don't think that the experimental drugs just now are not toxic, life is very important, be careful, and if your hands are very dirty, they may also stain the experimental instruments and reagents and samples, causing experimental errors. When you are working, don't wipe your white coat on whatever you get on your hands.

3. Communicate more with teachers, brothers and sisters.

Experimenting is not the same as working hard, and an essential part of doing experiments is communication. Behind closed doors, it's always you who suffers. If you have any difficult questions, this also reflects a kind of respect for the teacher.

4. Stupid birds need to fly first, and diligence can make up for clumsiness.

When you first enter the experiment, you must be diligent, careful, quick with your eyes and hands, and your brain must be functioning. The clutter in the laboratory has to be done in a hurry, do more things for others, and don't be afraid of losses. In this way, the first can liven up the atmosphere, and the second can handle interpersonal relationships.

5. Be sure to dispose of the waste liquid, classify it, clean it up in time, especially the toxic and harmful waste liquid should be conspicuously marked, and the discarded reagent bottle will be discarded without washing, in case the used acid bottle, someone will use it after picking it up, which is also dangerous.

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