Volumetric Flask with PP Stopper

To check the airtightness, invert the volumetric flask and observe for water leakage. Then rotate the cork 180 degrees to observe for water leakage. (1) Solute cannot be dissolved in the volumetric flask, but should be transferred to the flask after being dissolved in a beaker. (2) The total amount of solvent used to wash the beaker cannot exceed the marking on the volumetric flask. Once exceeded, it must be re prepared. (3) The volumetric flask cannot be heated. If the solute releases heat during the dissolution process, it should be transferred after the solution has cooled down, because as the temperature rises, both the bottle and the liquid will expand, and the expansion coefficient will be different, resulting in inaccurate volume measurement. (4) Volumetric flasks can only be used for preparing solutions and should not be stored for long periods of time, as the solution may corrode the bottle body, thereby affecting the accuracy of the volumetric flask. (5) After using the volumetric flask, it should be washed clean in a timely manner, the cork should be added, and a piece of paper should be sandwiched between the cork and the bottle mouth to prevent the cork from sticking to the bottle mouth. (6) A volumetric flask can only prepare a certain volume of solution, but generally retains 4 significant figures (such as 250.0ML). It cannot be estimated that the number after the decimal point will change just because the solution exceeds or does not reach the scale line, and can only be reconfigured. Therefore, when writing the volume of the solution, it must be XXX.0ML