Disodium tetraborate

PORONCOMPOUNDS - BORON OXIDES, BORIC ACID AND BORATES] (Vol 4) Disodium tetraborate pentahydrate [12045-88-4]... 

Disodium Tetraborate Decahydrate, In the Urhted States, neady all the refined borax is used for household cleaning products. Small amounts are used as fertilizers and herbicides. USP-grade borax is used in cosmetic and toilet goods, in which purity is demanded. Special quahty-grade borax is used in electrolytic capacitors, in nuclear apphcations, and as a laboratory chemical. 

Disodium Tetraborate Pentahydrate, Refined pentahydrate consumed in the Urhted States is used in insulation fiber glass, glass, fertilizers, and herbicides. Smaller amounts are used in antifreeze (see Antifreezes and deicing fluids), ceramic glazes, and cleaning agents. About 40% of the pentahydrate produced in the Urhted States is exported (101). A large-scale apphcation of this chemical is in the preparation of perborate bleaches. 

Disodium Tetraborate, In the Urhted States, anhydrous borax finds most apphcation in the glass industry for enamels, borosihcate glass, and fiber glass insulation. It is also used as an antifreeze additive and as an algicide in industrial water. 

Disodium pentacarbonylchromide, 6 528 Disodium phosphate, 18 833 Disodium pyrophosphate, 18 841 Disodium salicylate, 22 3 Disodium tetraborate tetrahydrate, 4 242t, 265-266... 

Fig. 9 Electropherograms showing 3 nM fluorescently labeled 11-mer in the absence (A) and in the presence (B) of 0.7 /j,M SSB protein in the running buffer. The conditions used were as follows separation capillary, 35 cm, 20-/xm i.d. running buffer, 25 mM disodium tetraborate (pH 9.1) separation voltage, 25 kV excitation wavelength, 488 nm emission wavelength, 515 nm and temperature, 25 (1°C. Approximately 1 nL of sample solution was injected electrokinetically. The asterisk indicates the migration time of the solvent, The traces Iv and Ih, corresponding to vertically and horizontally polarized fluorescence intensities, respectively, are shown separated for clarity. (From Ref. 48.)...

Synonyms sodium tetraborate disodium tetraborate anhydrous borax... 

Formula Na2B407 IOH2O MW 381.37 Synonym disodium tetraborate decahydrate... 

Synonyms disodium tetraborate pentahydrate sodium tetraborate pentahydrate tincalconite (mineral)... 

Disodium Tetraborate Decahydrate (Borax Decahydrate). Disodium tetraborate decahydrate, Na2B40 101I, 0 or Na20 2B203 1 HI I (). formula wt, 381.36 monoclinic sp gr, 1.71 specific heat 1.611 kj/ (kg-K) [0.385 kcal/(g°C] at 25—50°C (68) heat of formation, —6.2643 MJ/mol (—1497.2 kcal/mol) (69) exists in nature as the mineral borax. Its crystal habit, nucleation, and growth rate are sensitive to inorganic and surface active otganic modifiers (70). 

Disodium Tetraborate Tetrahydrate. Disodium tetraborate tetrahydrate, Na I C TH O or Na20 2B203 4H20, formula wt, 273.27 monoclinic sp gr, 1.908 specific heat, ca 1.2 kJ/(kg K) [0.287 kcal/(g °C)] (61) heat of formation, —4.4890 MJ/mol ( — 1072.9 kcal/mol) (69) exists in nature as the mineral kemite and has a structural formula Na2[B40 (0H)2] 3H20. The crystals have two perfect cleavages and when ground, form elongated splinters. 

Effect of pH on the addition reactions was studied from pH 4 to 10. For pH values below 7, the reaction was buffered with a 25 mM sodium acetate solution whereas for pH values above 7, a 25 mM disodium tetraborate solution was used the pH was adjusted by adding either HC1 or NaOH. The combination electrode used for the determination of experimental pH, was calibrated with National Bureau of Standards (NBS) buffers for Milli-Q water (36) and tris(hydroxymethyl)aminomethane (TRIS) buffers for seawater (37) and NaCl solutions (38) on the pHF (free proton) scale. Since the addition of reactants caused a small pH change in the buffered medium, the experimental pH values shown in the results were measured after the reactants were added to reaction bottle. Samples from low pH reaction series were adjusted topH 9 by addition of a strong borate buffer just prior to HPLC analysis. Inis was necessary because thiol analysis using o-phthalaldehyde requires this pH for optimum derivatization. 

---