Introduce the use of laboratory glassware the beaker flask measuring cylinder and others

1.Test tubes are commonly used:

1. a small amount of reagent reaction vessel;
2. can also be used as a container for collecting a small amount of gas;
3. or a generator for installing a small gas.

2.The beaker is mainly used for:

1. to dissolve solid matter, to prepare a solution, and to dilute and concentrate the solution;
2. can also be used as a reaction between a relatively large amount of substances.

3. Flask (round bottom flask, flat bottom flask):

1. It is often used to make a large amount of liquid reaction;
2. It can also be used as a device gas generator.

4. Erlenmeyer bottles are commonly used for:

1. heating liquid;
2. It can also be used for device gas generators and bottle washers;
3. It can also be used for drip containers in titration.

5.Evaporating dishes are usually used for concentration or evaporation of solutions.

6.The plastic dropper is used to remove and add a small amount of liquid.

Note:

1. When using, the plastic head is on the top and the nozzle is underneath (to prevent the liquid reagent from entering the plastic head and causing the plastic head to corrode or bring the impurities in the plastic head into the test solution;
2. the dropper nozzle cannot protrude into the drip container ( Prevent the dropper from being stained with other reagents;
3. Wash it immediately after use and insert it into a clean test tube. The unwashed dropper is strictly prohibited to absorb other reagents. The dropper on the 4-dropper bottle must be used with the dropper bottle.

7.A measuring cylinder for measuring a certain volume of liquid.

Do not dilute or formulate the solution in the measuring cylinder, never heat the measuring cylinder; 2 carry out a chemical reaction in the measuring cylinder.
Note: When measuring the liquid, select the appropriate size of the cylinder according to the volume of the volume (otherwise it will cause a large error). When reading, the cylinder should be placed vertically on the table and the scale of the cylinder and the cylinder inside the cylinder. The lowest point of the liquid recess is maintained at the same level.

8. The pallet balance is a weighing instrument, generally accurate to 0.1 grams.

Note: The weighing object is placed on the left disk, the weight is placed on the right disk in the order of large to small, and the weight is used to use the tweezers. It cannot be directly used by the hand. The balance cannot weigh the hot object. Place on the tray, put the same quality paper on both sides, deliquescent drugs or corrosive drugs (such as sodium hydroxide solids) must be weighed in glassware.

9. Gas cylinder

1. It is used to collect or store a small amount of gas:
2. It can also be used to carry out the reaction of certain substances and gases. (The mouth of the bottle is sanded).

10.jar (the inner wall is sanded):

It is often used to hold solid reagents, and can also be used as a gas cylinder

11. Bottles:

It is used to hold liquid reagents.

Brown jars are used to hold substances that need to be stored in the dark. When storing alkali solution, the reagent bottle should be rubber stopper, and glass stopper should not be used.

12. A funnel

It is used to inject liquid into a fine mouthed container or for a filtering device.

13. The long-neck funnel

It is used to inject liquid into the reaction vessel. If the gas is used to prepare the gas, the lower end of the long-neck funnel is inserted below the liquid surface to form a “liquid seal” (to prevent gas from the long neck bucket). Escape)

14. The separatory funnel

It is mainly used to separate two liquids that are incompatible with each other and have different densities. It can also be used to add liquid to the reaction vessel to control the amount of liquid.

15. The test tube clamp

It is used to hold the test tube, and the test tube is heated. When used, the test tube is placed from the bottom of the test tube to the upper part of the test tube.

16. An iron stand

It is used to fix and support a variety of instruments, often used for heating, filtration and other operations.

17. Alcohol lamp:

1. Check the wick before use, it is absolutely forbidden to add alcohol to the burning alcohol lamp;
2. Do not use a burning alcohol lamp to ignite another alcohol lamp (to avoid fire)
3. The outer flame of the alcohol lamp is the highest, and should be heated in the outer part of the outer flame before being preheated.
4. to prevent the wick from coming into contact with hot glassware (to prevent damage to the glassware)
5. At the end of the experiment, apply the lamp cap to extinguish (to avoid the alcohol in the lamp to volatilize and leave too much moisture in the lamp core, not only waste alcohol and not easy to ignite), and must not be blown out with the mouth (otherwise it may cause alcohol burning in the lamp, which may occur Danger)

If the alcohol is burned on the table, it should be covered with a wet rag immediately.

18. The glass rod

It is used for stirring (accelerated dissolution) transfer such as pH measurement.

19. Burning spoon

20. The high temperature thermometer

That has just been used by the thermometer should not be rinsed immediately with cold water.

21. The medicine spoon

It is used for taking solid medicines in powder or granules.

The spoon should be cleaned with a clean filter paper before each use.