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| | ANHYDROUSSODIUMTETRABORATE Basic information |
| | ANHYDROUSSODIUMTETRABORATE Chemical Properties |
| | ANHYDROUSSODIUMTETRABORATE Usage And Synthesis |
| Chemical Properties |
Anhydrous sodium tetraborate is a large, colorless, transparent crystal, which effloresces superficially when stored in dry air. Water is split off on heating; above 350℃, Na3B4O7 is formed.
| | Preparation | To prepare very pure, formula-weight borax as a primary standard, good quality commercial product is recrystallized three times from water and dried to constant weight in a vacuum desiccator over a desiccant with suitable vapor pressure. Recent studies have shown that the best desiccant consists of solid NaCl, sucrose and a saturated sucrose solution. The correct water content (47.21%) is achieved by drying a sample in a Pt crucible, first on a steam bath, then at 200°C, and finally between 700-800°C. To check for any further impurities, cf. I. M. Kolthoff, Gravimetric Analysis, II (pp. 97-98). |
| | ANHYDROUSSODIUMTETRABORATE Preparation Products And Raw materials |
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