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Precautions for the use of heating chemical instruments
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Precautions for the use of heating chemical instruments

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(1) Test tube

A container used to hold a small amount of medicine, a small amount of reagent reaction under normal temperature or heating, can be used to prepare or collect a small amount of gas.


Precautions for use:

①It can be heated directly and clamped at 1/3 away from the mouth of the test tube with a test tube clamp.


②The liquid placed in the test tube shall not exceed 1/2 of the volume of the test tube when it is not heated, and not exceed 1/3 when it is heated.


③It cannot be cooled rapidly after heating to prevent explosion.


④The test tube mouth should not face anyone when heating; when heating the solid, the test tube should be placed horizontally and the mouth of the tube should be slightly inclined downward.

(2) Beaker

Used as a reaction container for preparing solutions and a larger amount of reagents, used at room temperature or heating.


Precautions for use:

①When heating, it should be placed on the asbestos net to make the heating evenly.


②When the dissolved substance is stirred with a glass rod, it should not touch the wall or bottom of the cup.

(3) Flask

Used for containers with large reagents and liquid substances participating in the reaction, which can be divided into round-bottom flasks, flat-bottom flasks and distillation flasks. They can all be used to assemble gas generating devices. The distillation flask is used for distillation to separate miscible substances with different boiling points.


Precautions for use:

①Round-bottom flasks and distillation flasks can be used for heating, asbestos nets should be used when heating, and can also be used for other hot baths (such as water bath heating, etc.).


②Do not add liquid more than 1/2 of the volume of the flask.

(4) Evaporating dish

Used to evaporate liquids or concentrate solutions.


Precautions for use:

①It can be heated directly, but not quenched.


②The liquid volume should not exceed 2/3 of the volume of the evaporating dish.


③ Crucible tongs should be used to take and put the evaporation dish.

(5) Crucible

Mainly used for high temperature burning of solid materials.


Precautions for use:

①Put the crucible on the mud triangle on the tripod and heat it directly.


② Use crucible tongs when taking and putting the crucible.

(6) Alcohol lamp

Commonly used heating source in chemical experiments.


Precautions for use:

①The wick of the alcohol lamp should be flat.


② When adding alcohol, it should not exceed 2/3 of the volume of the alcohol lamp; the alcohol should not be less than 1/4.


③It is absolutely forbidden to add alcohol to the burning alcohol lamp to avoid fire.


④It is absolutely forbidden to ignite another alcohol lamp with an alcohol lamp.


⑤When the alcohol lamp is used up, it must be extinguished with the lamp cap, and the mouth should not be used to blow.


⑥Do not knock down the alcohol lamp. In case the spilled alcohol burns on the table, immediately cover it with a damp cloth.


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