Amino acid (Amino acid) as a molecular structure containing amino group (- NH2) and carboxyl (COOH) organic compounds. The formula is H2NRCOOH. Omega gamma delta beta alpha amino carbon atoms according to the connecting position in the carboxylic acid, can be divided into alpha, beta, gamma, Delta. Amino acids (C.C - C - C C - COOH).
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.