1. Access to medicines:
“Three inaccuracies”
- It is not allowed to touch the medicine by hand;
- It is not allowed to taste the taste of the medicine;
- It is not allowed to put the nostrils in the mouth of the container to smell
Note: The original reagent bottle can not be returned to the laboratory after it has been taken out or used.
A: Access to solid medicines
Use a tweezers for block solids (specific operation: first place the container horizontally, put the medicine into the mouth of the container, and then slowly erect the container); use a spoon or paper when taking powder or small granular medicine Slot (Specific operation: first place the test tube horizontally, carefully feed the medicine spoon or paper trough into the bottom of the test tube, and then make the test tube stand upright)
B: Access to liquid medicines
A small dropper can be used when taking a small amount. When using a large amount, it can be directly poured from the reagent bottle. (Note: Pour the stopper on the table, the label is toward the palm of the hand, prevent the reagent from contaminating or corroding the label, and hold the test tube diagonally. , so that the mouth of the bottle is next to the test tube)
2.Heating of the substance The test tube, the flask, the beaker, and the evaporating dish can be used to heat the liquid;
Heat the solid using a dry test tube, evaporating dish, crucible
A: Heat the test tube to the liquid in the test tube. Generally, it should be at a 45° angle to the table top. After preheating, concentrate on the bottom of the test tube and heat it.
B: Heat the solid in the test tube: the test tube mouth should be slightly downward (to prevent the generated water from flowing back to the bottom of the tube, and the test tube is broken).
Note: The outer wall of the instrument to be heated should not have water. Dry it before heating to prevent the container from bursting. When heating, the bottom of the glass instrument should not touch the center of the alcohol lamp to avoid the container from rupturing. Hot-burned containers should not be rinsed immediately with cold water, nor placed on the table immediately, and should be placed on asbestos.
3. Filtration is a method of separating insoluble solids from liquids (i.e., a solution, an insoluble solution, necessarily using a filtration method) such as crude salt purification, and separation of potassium chloride and manganese dioxide.
Operation points: “One paste”, “two low”, “three”
“One paste” means that the filter paper wetted with water should be close to the funnel wall;
“Two papers” means that the edge of the filter paper is slightly lower than the edge of the funnel 2 and the liquid level of the filtrate is slightly lower than the edge of the filter paper;
“Three-way” means
- beaker close to glass rod
- glass rod close to three layers of filter paper
- end of funnel close to inner wall of beaker
4. When assembling and assembling the instrument, it is generally carried out in order from low to high and from left to right.
5. Check the airtightness of the device. First, immerse the pipe in the water, then tighten the object with the palm of the hand. (Phenomenon: There is a bubble in the nozzle. When the hand leaves, a section of water is formed in the pipe.
6.The washing of the glass instrument, such as insoluble alkali, carbonate, alkaline oxide, etc., may be added to the instrument, and may be washed with dilute hydrochloric acid and then rinsed with water. If the instrument is accompanied by grease, it can be washed with hot soda solution, or it can be washed with detergent or decontamination powder. The standard for cleaning is that the water on the inner wall of the instrument does not form water droplets, and does not flow down into the stream. When a layer of water film is evenly attached, it indicates that it has been washed clean.
7.Commonly used accident handling methods
A: When using an alcohol lamp, inadvertently causing alcohol to burn, use a wet cloth immediately.
B: The acid solution is accidentally sprinkled on the table or the skin is washed with sodium bicarbonate solution.
C: The alkaline solution was accidentally sprinkled on the table and rinsed with acetic acid. Inadvertently sprinkle on the skin and rinse with boric acid solution.
D: If concentrated sulfuric acid is accidentally sprinkled on the skin, do not rinse with plenty of water first.
If you’re in need of information or have any questions, please contact WUBOLAB, the laboratory glassware manufacturer.
