OrthoBorate, sodium

Wa.terBa.la.nce Chemicals. Water balance chemicals include muriatic acid, sodium bisulfate, and soda ash for pH control, sodium bicarbonate for alkalinity adjustment, and calcium chloride for hardness adjustment. A recent development is use of buffering agents for pH control. One of these products, sodium tetraborate, hydrolyzes to boric acid and a small amount of orthoborate (50) which provides significantly less buffering than carbonate and cyanurate alkalinity in the recommended pool pH range of 7.2—7.8 even at 100 ppm. 

In this preparation, borax, the sodium salt of tetraboric acid, is chosen as the source of boron. Although boron is decidedly a non-metal, still its acid-forming characteristics are not highly developed and its acids are readily displaced by strong acids from solutions of their salts. Thus tetraboric acid, H2B4O7, would be set free from borax by hydrochloric acid, but the acid which actually crystallizes is the more highly hydrated orthoboric acid, H3BO3. 

The pO drop at the equivalence point corresponds to the ligand number 1, which confirms the running of the interaction (1.2.91) in molten Nal. This interaction is characterized by a pK value of —5.02 0.6. It should be emphasized that with the excess of the Lux acid the equilibrium is achieved slowly enough. This seems to be caused by the fact that sodium tetraborate is practically completely polymerized, although the polymerizations effects on the titration process are less pronounced than in the case of B203. After the equivalence point, with the pO drop of 3-3.5 pO units, the equilibrium conditions are achieved in a shorter period, since under these conditions all the polymerized particles are destroyed. The excess of the base over that necessary for the formation of B02 results in the fixation of O2- by the formed metaborate, which demonstrates the oxoacidic properties. The dependence of the ligand number on the initial titrant molality allows us to assume that the final product is sodium orthoborate, B03- (equation (1.2.92)), whose pK value is close to 2. All that we have said above shows that the oxoacidic properties of tetraborate ions in molten sodium iodide are stronger... 

Sodium orthoborate is formed by the reaction of B2O3 with NaaC03 at temperatures above 680°C. 

Triisopropyl naphthalenesulfonic acid, sodium salt 2,6,7-Trilsopropylnaphthalenesulfonic acid, sodium salt. See Sodium triisopropyl naphthalene sulfonate Triisopropyl orthoborate. See Triisopropyl borate... 

A boron compound is added as a crosslinking agent. Examples of the boron compoxmd that can be used are boric acids and borates. The kind of boric acid is not specifically limited, but orthoboric acid, metaboric acid, and paraboric acid may be used. Examples of borates are sodium salts, potassium salts, and ammonium salts (26). 

The rare earth orthoborates are extremely resistant to water and sodium hydroxide even at elevated temperature, but they are attacked by dilute hydrochloric add (Isupova and Lileev, 1965). The 1 3 borates are attacked by both alkali and adds. 

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