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Anonymous users2024-02-16Access to solid medicines:
1.Keep in jars.
2.It is usually used with a medicine spoon or paper tray.
To operate, tilt the tube, carefully place the spoon to the bottom of the tube, and then make the tube upright.
One tilt, two send, three upright).
3.Lumpy medicines are generally picked up with tweezers.
When operating, the container is placed horizontally, and after the drug or metal particles are put into the container mouth, the container is slowly erected, so that the drug or metal particles slowly slide to the bottom of the container to avoid breaking the container.
One horizontal, two put, three slow vertical).
4.Use a spoon or tweezers should be wiped clean immediately with clean paper.
Access to liquid medicines:
1.Liquid medicines are usually served in fine-necked bottles. Jars, fine-mouthed bottles, etc., are frosted to increase the airtightness of the container.
2.Take an unmetered (more) liquid – pour it directly.
3.Precautions for use (in parentheses for the purpose of operation):
a) The stopper of the bottle must be placed upside down on the table [to prevent the drug from corroding the laboratory bench or contaminating the drug].
b) The mouth of the bottle must be close to the mouth of the test tube, and pour it slowly [to prevent the loss of liquid medicine].
c) The side of the label of the bottle must be facing the palm of the hand [to prevent the liquid medicine from spilling and corroding the label].
d) After pouring the liquid, immediately close the cork and put the bottle back in its original place with the label facing out [to prevent deliquescent and deterioration of the drug].
4.Dispense undosed (less) liquids – use a gel-tip dropper.
5.Precautions for use (in parentheses for the purpose of operation):
a) should be instilled vertically directly above the container; Do not touch the wall of the container with the dropper [to prevent contamination of the test tube or contamination of the reagent] b) After taking the liquid, the rubber rubber cap should be kept on top, not flat or inverted [to prevent the liquid from backflowing, staining the reagent or corroding the rubber cap].
c) Rinse the used test tubes with clean water immediately; However, the dropper on the dropper bottle cannot be rinsed with water and cannot be cross-used.
6.Take a certain amount of liquid - use a graduated cylinder Precautions when using:
a) When the liquid poured in the vector cylinder is close to the required scale, stop the dumping, and add the liquid dropper to the required scale mark with the rubber tip dropper.
b) When reading, the graduated cylinder must be flat, and the line of sight should be kept level with the lowest part of the concave surface of the liquid in the graduated cylinder, and then the volume of the liquid should be read [small in the upward view, large in the downward view].
Excerpt from the textbook for the third year of junior high school.
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Anonymous users2024-02-15<>1. The storage of reagents should be stored separately, easy to access, pay attention to safety, and ensure quality. Strong oxidants and flammable products must be strictly separated to avoid the release of heat and combustion caused by the occurrence of violent oxygenation. Volatile acids or bases should not be mixed with other reagents to avoid deterioration of reagents;
2. The reagents stored in the cabinet or on the reagent rack should be classified according to a certain rule and placed in a fixed position in order to provide convenience for finding and retrieving;
3. Reagents of the same subclass can be placed in the order of the reagent name. The label on the chemical reagent container should be firmly pasted and legible; In order to prevent the handwriting from collapsing and blurring due to corrosion, you can use a brush to apply the molten paraffin liquid to the label, 4, or cover it with scotch tape. Reagents that are not labeled and cannot be identified and confirmed cannot be used, and should be harmless in time.
Different varieties of reagents should be placed at a certain interval.
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Anonymous users2024-02-14What are the rules for the use of chemicals in the laboratory?
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Anonymous users2024-02-13Take an unmeasured (more) liquid – pour A. directlyThe stopper must be placed upside down on the table [to prevent the drug from corroding the laboratory bench or contaminating the drug]; b.When pouring directly, the mouth of the bottle must be close to the mouth of the test tube, the test tube is 45 degrees, and pour slowly [to prevent the loss of liquid medicine]; c.
The side of the label must be facing the palm of the hand [to prevent the liquid medicine from spilling and corroding the label]; d.After pouring the liquid, immediately close the cork and put the bottle back in its original place with the label facing out [to prevent deliquescent and deterioration of the drug]. 2. Take a small amount of liquid - use the rubber tip dropper a
It should be instilled vertically just above the container; Do not touch the wall of the container [to prevent contamination of the test tube or contamination of the reagent]; b.After taking the liquid, the dropper should be kept on the rubber cap, not flat or upside down [to prevent the liquid from backflowing, staining the reagent or corroding the rubber cap]; c.The used test tube should be rinsed with water immediately; However, the dropper on the dropper bottle cannot be rinsed with water and cannot be cross-used.
3. Take a certain amount of liquid - use a graduated cylinder aWhen the liquid is dumped in the vector cylinder close to the required scale, stop dumping, and add the liquid medicine dropwise to the required scale mark with a rubber head dropper; b.When reading, the graduated cylinder must be placed steadily, and the line of sight must be kept level with the lowest part of the concave surface of the liquid in the graduated cylinder.
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Anonymous users2024-02-121. Do three no's.
Do not smell the smell of medicines, especially gases, directly.
Don't taste Don't taste the taste of medicine.
Do not touch the medicine directly with your hands.
2. Save medicines.
The amount of medicine to be taken should be taken according to the requirements, if there is no requirement, take the minimum amount (solid: cover the bottom of the test tube; liquid 1-2 ml).
3. The leftover medicine should be placed in the designated position (container), and cannot be put back into the original bottle, nor can it be poured out, let alone taken out of the laboratory.
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Anonymous users2024-02-11The three principles of chemical use:
1.Do not touch the medicine with your hands;
2.Do not put your nostrils to the mouth of the container to smell the smell of the medicine (apply the method of invoking air into the nose);
3.Do not taste any medicines.
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Anonymous users2024-02-10Do not take it by hand, use tweezers or a medicine spoon, etc.
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Anonymous users2024-02-091. The principle of "three noes": do not touch the drug with your hands, do not taste the taste of the drug, and do not put your nose to the mouth of the container to smell the smell of the drug (apply the method of attracting air into the nose). 2. The principle of "minimum amount":
When the drug does not specify the dosage, the general liquid is 1ml-2ml, and the solid only needs to cover the bottom of the test tube. 3. The principle of "three noes and one want": the leftover drugs should not be put back into the original bottle; Do not discard with it; Don't take out the lab; To be placed in the specified container.
4. The use of solid medicines: the block solid is taken with tweezers, the powder or fine crystals are taken with a medicine spoon, and the paper trough can be taken if necessary. Operation:
Place the tube horizontally, send the drug to the bottom of the tube, and then erect the tube. Pallet balances are used for weighing solid drugs, with the drugs placed on the left plate and the weights placed on the right plate. 5. Access to liquid medicines:
The cork is placed upside down, the label of the reagent bottle is to the palm of the hand, the bottle is against the mouth of the test tube, and the cork is tightly closed after pouring, and the reagent bottle is put back in its original place. (1) Instruments for taking liquids quantitatively: graduated cylinders and droppers.
And the size of the graduated cylinder only needs to be slightly larger than the volume to be measured. (2) The correct reading of the graduated cylinder: the graduated cylinder is flat, the line of sight is kept level with the lowest part of the concave surface of the liquid in the graduated cylinder, and then the volume of the liquid is read out (if you look up, the reading will be small, and if you look down, the reading will be large).
3) Dropper for sucking and dropping a small amount of liquid: The dropper should be perpendicular to the mouth of the test tube, and the dropper should not be extended into the test tube or touch the inner wall of the test tube.
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