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.
Primary standards is of high purity, less impurity, good stability, chemical composition constant. Capacity analysis, the reference reagent in determination of pH in determination of calorific value, and so on. Have the first reference and classification standard of each classification. Where the first reference must be made by the National Institute of metrology verification. The production units used as the first reference standard benchmark products. At present, reference reagent business mainly refers to the capacity analysis in capacity analysis of benchmark [content range 99.95%~100.05% (gravimetric titration). Generally used to calibrate the titrant.
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