Main factors affecting the weighing results of electronic balances 1, storage time Electronic balances are themselves sophisticated electronic instruments. Once stored for a long time, they will cause deviations in their internal electronic systems, and then the results of the symmetry will affect them. Therefore, before using electronic balances for weighing, be sure to balance

Common purification and separation methods in laboratories Purification refers to purifying the mixture to remove impurities, and obtaining the host material in the mixture, and the purified impurities do not have to consider the chemical composition and physical state. There are many ways to separate mixtures, but they can be divided into two broad categories