The main purpose of the beaker and matters needing attention

1. The main purposes of the beaker are as follows:

(1) The reactor of the substance and the determination of the combustion products.

(2) Dissolve and crystallize a substance.

(3) Take, evaporate and concentrate or heat the solution.

(4) Weigh corrosive solid medicines.

The beaker is used as a reaction vessel for preparing solutions, dissolved substances, and larger amounts of substances at room temperature or under heating.

2. Pay attention to the use of beaker:

(1) When heating the beaker, it should be covered with asbestos net to evenly supply heat. Do not use flame to heat the beaker directly, because the bottom surface of the beaker is large, heating directly with flame can only burn to a local area, causing uneven heating of the glass and causing explosion. When heating, the outer wall of the beaker must be wiped dry.

(2) When used for dissolution, the amount of liquid should not exceed 1/3 of the volume of the beaker, and it should be gently stirred with a glass rod. Do not touch the bottom or wall of the cup when stirring with a glass rod during the dissolution or dilution process.

(3) When heating the liquid, do not exceed 2/3 of the volume of the beaker, generally 1/3 of the volume of the beaker is appropriate.

(4) When heating corrosive chemicals, a watch glass can be placed on the mouth of the beaker to prevent liquid from spilling.

(5) Do not use a beaker to hold chemicals for a long time to avoid falling into dust and evaporating water in the solution.

(6) Do not use a beaker to measure liquid.