Preparation of borax is the basic raw material boron-containing compound, almost all containing boron can be prepared by the borax. They metallurgy, steel, machinery, military, tools, paper, tubes, chemical and textile sectors have an important and wide range of uses. 3. hydrochloric acid titration solution (0.1mol / L), preparation: take hydrochloric acid 9.0mL, add water to make into 1000mL, shake, have 0.1mol / L hydrochloric acid titrant. To about 0.4g, accurately weighed, add water 25ml dissolved, add 0.05% methyl orange solution 1 drop titration with hydrochloric acid solution (0.1mol / L) titrated to orange-red borax use, boil two minutes, cooling, such as yellow solution, continue titration until the solution was orange-red, and neutral glycerol (glycerin take 80ml, 20ml water and phenolphthalein indicator solution 1 drop of sodium hydroxide (0.1mol / L) titrated to pink) 80ml and phenolphthalein 8 drops of indicator solution, titration with sodium hydroxide solution (0.1mol / L) to a pink color. Each 1ml of sodium hydroxide (0.1mol / L) is equivalent to 9.534mg of Na2B4O7.10H2O. Herbicide for non-farming district weeding Destuctive borax role, in addition to individual users, but mixed with sodium chlorate, sodium chlorate to reduce flammability. In refrigerators, freezers, air conditioners and other refrigeration equipment welding repairs often as (inactive) flux for purifying the metal surface. Remove oxides on the metal surface; adding a certain percentage of sodium chloride in borax. Compound sodium fluoride, potassium chloride can be used as an active flux for soldering copper pipe and steel pipe, steel pipe and steel pipe between the refrigeration equipment. [Occurrence and composition] produced in the evaporation of salt lake sediments and dry arid regions in Salt Lake with rock salt, trona, Ulexite, thenardite, mirabilite potassium, calcium Glauber's salt, gypsum, calcite, saltpeter sodium carbonate Glauber's salt and other associated rare sulfate. In dry air, dehydration becomes easy to tripartite borax borax as a white powder. Chinese name: borax. Chemical formula: Na2B4O7 · 10H2O. Molecular Weight: 381.37CAS. Melting point: about 880 ℃. Boiling point: 1575 ℃. Water solubility: soluble in water. Density; 1.69 ~ 1.72 Appearance: White fine crystals. Colorless translucent crystals or white crystalline powder. Odorless, salty taste. Molecular structure of losing the whole borax [1] section 1.73.380 ℃ when the proportion of crystal water. Soluble in water and glycerine, slightly soluble in alcohol. Aqueous solution is alkaline. Borax in the air can slow weathering. Melting into a colorless glass-like substance. Borax has bactericidal action, oral harmful to people. Borax nature _ three level Chemical (Online) _ borax provided by the Jinan Chemical Co., Ltd. three levels. Jinan three ping Chemical Co., Ltd. (www.sanpinghuagong.com) Shandong Jinan, chemical products leader, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. Three-ping Chemical leadership with the staff warmly welcome all inquiries negotiations to create three levels of chemical better future.