Cup wall overflow type constant volume cup

Abstract

The invention discloses a cup wall overflow type constant volume cup which comprises a beaker and a constant volume pipe, the constant volume pipe is a semi-cylinder and is embedded in the outer wallof the beaker, and calibration scale marks are arranged on the constant volume pipe; an overflow hole is formed in the wall, wrapped by the constant volume pipe, of the beaker, and the overflow hole is located above the scale marks, so that the interior of the beaker is communicated with the constant volume pipe; the position of the scale mark is a liquid fixed constant volume value formed when the beaker is full of liquid to the lower edge of the overflow hole and the constant volume pipe is full of liquid to the scale mark. According to the invention, existing experimental equipment is modified; on the premise of ensuring the preparation precision, solute can be dissolved by directly utilizing the constant volume cup by utilizing the principle of reducing visual errors, which is the sameas that of an existing volumetric flask, so that the operation steps of washing, transferring and the like are reduced, the preparation process is simplified, and errors caused by human factors in excessive operation processes are more effectively reduced.

Description

technical field [0001] The invention belongs to the technical field of experimental instruments, and in particular relates to a cup wall overflow constant volume cup. Background technique [0002] At present, the volumetric flask, which is an instrument used in the laboratory to prepare a solution with a certain concentration of a substance, has a main structure consisting of a large-capacity bottle belly that carries the solution, and a small volumetric flask that is used to reduce visual errors and more accurately calibrate the final volume of the solution. The neck and the cork are joined together. During use, it is necessary to dissolve the solute in the beaker in advance, transfer it to the volumetric flask after cooling, then wash the beaker and glass rod with distilled water, pour the washing liquid into the volumetric flask, and continue to add water until the water level is close to the scale above the narrow neck When the line is broken, use a plastic-tip dropper ...

AI Technical Summary

Problems solved by technology

Due to the limitation of the slender neck of the volumetric flask, it is not conducive to the implementation of the stirring operation, so it cannot be directly used as a container for dissolving the solute, so the beaker must be used in the preparation process, so that the two main steps of washing and transferring are added out of thin air. Increasing the number of steps will undoubtedly increase uncertain factors such as solution splashing and unclean washing during the configuration process, which will increase the error between the actual concentration of the prepared solution and the theoretical concentration.

And because the bottleneck of the volumetric flask is relatively thin, the operation of transferring and constant volume is extremely inconvenient. Therefore, the current general-purpose volumetric flask still has many deficiencies and relatively large defects in design.

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