Normal solution for a liter of water solution in a solution containing one gram equivalent solute, refers to the concentration of 1N solution. The indicator indicator (Indicator) is affected by the existence of certain substances to change their color material. Mainly used for indicating the end point drop in volumetric analysis. In general can be divided into acid the indicator, redox indicator, indicator indicator. In addition to adsorption analysis, can also be used to test the gas or solution of some harmful toxic substances.
MSDS, international known as chemical safety information card, is the physical and chemical properties of the chemical manufacturers and distributors must provide according to the legal requirements of the chemicals (such as pH, flash, flammable, toxic, reactive etc.), environmental hazards, and health of users (such as carcinogenic, teratogenic) may produce a comprehensive document. It includes the harm of hazardous chemicals Flammable, explosive properties, toxicity and environmental hazards, and safety, emergency handling, the main physical and chemical parameters, the comprehensive laws and regulations on the information.
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