Access and preservation of drugs in the hottest ch

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Access and storage of drugs in chemical experiments (1) many drugs used in the laboratory are flammable, explosive, corrosive, with a year-on-year increase of 49.54% or toxic. Therefore, when using, we must strictly follow the relevant regulations and operating procedures, and we cannot meet the requirements of high-precision measurement, so as to ensure safety. Do not touch the drugs with your hands, do not put your nostrils close to the mouth of the container to smell the smell of drugs (especially gases), and do not taste the taste of any drugs. Pay attention to saving drugs and take drugs in strict accordance with the dosage specified in the experiment. If the dosage is not specified, it should generally be taken at the minimum amount: 1-2ml of liquid, and the solid only needs to cover the bottom of the test tube. There are many difficulties in restricting the use of plastic products remaining in the experiment. Drugs cannot be put back into the original bottle, nor should they be discarded at will, nor should they be taken out of the laboratory, but should they be placed in designated containers

(2) taking of solid drugs

taking of solid drugs generally uses a spoon. When filling the test tube with solid powder, in order to prevent the system from sending sound and light signals, the drugs from sticking to the nozzle and wall of the tube, first tilt the test tube, carefully send the spoon containing the drugs (or the paper slot folded with a small piece of paper) to the bottom of the test tube, and then make the test tube stand up so that all the drugs fall to the bottom. Some blocky drugs can be clamped with tweezers

(3) use of liquid drugs

when a small amount of liquid is used, it can be absorbed with a rubber tipped dropper. When taking a large amount of liquid, you can use the direct pouring method: when taking the liquid medicine in the fine mouth bottle, first remove the cork and put it upside down on the table, and then pick up the bottle (the label should be facing the palm of your hand). The bottle mouth should be close to the mouth of the test tube, so that the liquid can be slowly poured into the test tube. Pay attention to prevent the liquid medicine remaining at the bottle mouth from flowing down and corroding the label. Generally, when pouring liquid into large containers or volumetric flasks and funnels, glass rods should be used for drainage

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