Analytical chemistry experiments should use pure water, generally distilled water or deionized water. Some experiments require the use of double distilled water or higher specifications of pure water (for example, experiments in electroanalytical chemistry , liquid chromatography, etc.). Pure water is not absolutely free of impurities, but the content of impurities is very small. Note: It is difficult to determine the true pH value in water of primary and secondary purity. Therefore, the range of its pH value is not regulated; in primary water, it is difficult to determine its oxidizable substances and evaporation residues, so it is not regulated. 1 distilled water Pure water obtained by removing non-volatile impurities from water by distillation is called distilled water. The same is the pure water obtained by distillation, and the type and content of impurities contained in it are also different. The water distilled with a glass distiller contains Na+ and SiO2- ions...
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