lab glassware use
(1) Test tubes are commonly used:
- small amount of reagent reaction vessel;
- It can also be used as a container for collecting small amounts of gas;
- or a generator for installing a small gas.
(2) Beakers are mainly used for:
- to dissolve the solid substance, the preparation solution and the dilution and concentration of the solution;
- can also be used to react between larger amounts of substances.
(3) Flask (round bottom flask, flat bottom flask)
- It is commonly used to make a large amount of liquid reaction;
- It can also be used as a device gas generator.
(4) Erlenmeyer bottles are commonly used to:
- heating the liquid;
- It can also be used to install gas generators and bottle washers;
- It can also be used in the drip container in the titration.
(5) Evaporating dishes are usually used for concentration or evaporation of the solution.
(6) The plastic dropper is used to remove and add a small amount of liquid.
note:
- 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 liquid);
- The dropper nozzle cannot extend into the drip container (to prevent the dropper from being stained with other reagents);
- After use, it should be washed immediately and inserted in a clean test tube. It is forbidden to take other reagents without washing the dropper;
- The dropper on the 4 drop bottle must be used with the dropper.
(7) A measuring cylinder for measuring a certain volume of liquid.
- Dilute or prepare the solution in the measuring cylinder, and never heat the measuring cylinder;
- Perform a chemical reaction in a graduated 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 gram.
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
- collecting or storing a small amount of gas;
- It can also be used to carry out the reaction of certain substances and gases. (The bottle mouth is sanded)
(10) jar (the inner wall is sanded)
Often used to hold solid reagents, can also be used as a gas cylinder;
(11) Fine mouth bottle:
It is used to hold liquid reagents. The brown bottle is used to hold substances that need to be stored in the dark. When storing the alkali solution, the rubber bottle should be applied to the reagent bottle.
(12) A funnel is used to inject liquid into the fine mouth container or for a filtering device.
(13) The long-neck funnel is used to inject liquid into the reaction vessel. If the gas is used to prepare gas, the lower end of the long-neck funnel should be inserted below the liquid surface to form a “liquid seal” (to prevent gas from the long neck bucket). Escape
(14) The separatory funnel 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 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 portion of the test tube.
(16) Iron stand is used to fix and support a variety of instruments, often used for heating, filtering and other operations.
(17) Alcohol lamp:
- Check the wick before use, it is absolutely forbidden to add alcohol to the burning alcohol lamp;
- It is also not possible to use a burning alcohol lamp to ignite another alcohol lamp (to avoid fire);
- 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.
- to prevent the wick from coming into contact with hot glassware (to prevent damage to the glassware);
- 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 to occur) Danger);
If the alcohol is burned on the table, it should be covered with a wet rag immediately.
(18) The glass rod is used for stirring (accelerated dissolution), for example, measurement of pH, and the like.
(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 is used for taking solid medicines in powder or granules. The spoon should be cleaned with a clean filter paper before each use.
