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Direct heating of chemical laboratory liquids
The heated liquid in the experiment is stable at a higher temperature without decomposing, and when there is no risk of ignition, the container to be heated can be directly heated by a gas lamp or the like. The laboratory is often used for direct fired glassware, such as beakers, flasks, evaporating dishes, test tubes, etc., can withstand a certain temperature, but can not be quenched and suddenly heated, so the water outside the vessel must be dried before heating. Nor can it be in immediate contact with wet objects.
1. Test tube heating. Generally, the test tube can be used for direct flame heating of liquid or solid. The following points should be noted when heating: the middle and upper parts of the test tube should be clamped with the test tube clamp; when heating the liquid, the test tube mouth should be slightly inclined upward, and the nozzle should not face the person. The liquid-proof spray will burn people; the parts of the liquid should be heated evenly; when heating the solid, the tube mouth should be tilted slightly downward to prevent the water droplets condensed on the tube mouth from flowing back to the bottom of the hot tube, causing the tube to rupture. The tube for heating the solid can be heated by means of a test tube holder or an iron stand.
2. Heating of beakers, flasks, and evaporating dishes. When heating the liquid with glassware such as beakers, flasks, and evaporating dishes, the utensils should be placed on the asbestos net, otherwise they will be broken due to uneven heating.
Burning of laboratory solid matter