Determination of zinc, calcium, silicon and titanium. To synthesize caffeine, adrenaline, aminoacetic acid and naphthylacetic acid. Make all kinds of dyes. rust remover. It is used in the production of pesticides and organic synthesis intermediates. Used as acidifier of starch adhesive. It is also an intermediate of dye, medicine, pesticide, synthetic resin and other organic synthetic materials. It is used to produce indigo dye in the dye industry. Chloroacetic acid is also an important carboxymethylating agent, which is used to prepare sodium carboxymethyl cellulose, ethylenediaminetetraacetic acid, etc., as well as non-ferrous metal flotation agent and chromatographic analysis reagent.