When doing chemical experiments, it is usually necessary to apply some instrument consumables. With different chemical experiments, the required instrument consumables are all the same. What are the most commonly used instruments in chemistry laboratories? How to wash these instruments?
1. Iron stand: used to fix and support various instruments, generally used for experimental operations such as filtration and heating
① Dissolving solid substances, preparing solutions, and diluting and concentrating solutions
② It can also be used as a reaction between a large number of substances
3. Graduated cylinder: measure the volume of liquid
4. Gas collecting cylinder: used to collect or store a small amount of gas, and can also be used as a reaction container for partial reactions
5. Test tube:
① Reaction container for a small amount of reagents
② It can also be used as a container for collecting a small amount of gas
③ or used to install a small gas generator
6. Test tube clamp: used to hold the test tube
7. Glass rod: used for stirring, filtering or transferring liquid
8. Alcohol lamp: used for heating
9. Plastic dropper: The plastic dropper is used to absorb and add a small amount of liquid
10. Dropping bottle: Dropping bottle is used to hold liquid medicine
11. Wide-mouth bottle: (the inner wall is brushed) It is often used to hold solid reagents, and can also be used as a gas collecting bottle
12. Narrow mouth bottle: a glass vessel used to store liquid reagents
13. Flask: There are round bottom flasks and flat bottom flasks ① commonly used for reactions between relatively large amounts of liquids ② can also be used as device gas generators
14. Erlenmeyer flask: ① Heating liquid, ② It can also be used to install gas generator and bottle washer ③ It can also be used for dripping container in titration.
15. Evaporating dish: usually used for concentrating or evaporating solutions.
16. Funnel: used to add liquid to test tubes, alcohol lamps, etc. There are ordinary funnels, separatory funnels (which allow you to control the flow rate) and long-necked funnels.
1. Pour waste residue and waste liquid into the waste liquid tank, and pour useful substances into the designated container.
2. Cleaning standards for glass instruments: the water attached to the glass instruments neither gathers into water droplets nor flows down in strands
3. Grease is attached to the glassware: first wash it with hot soda ash (Na2CO3) solution or washing powder, and then rinse it with water.
4. Alkalis, alkaline oxides, and carbonates that are insoluble in water are attached to glass instruments: first dissolve them with dilute hydrochloric acid, and then rinse them with water.
5. After the instrument is cleaned, it cannot be placed randomly. After the test tube is cleaned, it should be inserted upside down on the test tube rack to dry.
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