1303-96-4
Product Name:
Sodium tetraborate decahydrate
Formula:
B4H20Na2O17
Synonyms:
Borax decahydrate;Sodium borate decahydrate;di-Sodium tetraborate decahydrate;Sodium Borate, Decahydrate;Sodium Tetraborate, Dodecahydrate, Borax
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CHEMICAL AND PHYSICAL PROPERTIES
| Physical Description | Dry Powder; NKRA; Other Solid; Pellets or Large Crystals |
|---|---|
| Color/Form | White, monoclinic crystals |
| Odor | Odorless |
| Taste | Alkaline |
| Boiling Point | 608 °F |
| Melting Point | 75 °C (decomposes) |
| Solubility | Aqueous solution is alkaline to litmus and phenolphthalein; pH about pH = 9.5 |
| Density | 1.73 g/cu cm |
| Vapor Pressure | Approximately 0 mm Hg |
| Stability/Shelf Life | Stable. When heated above about 62 °C, borax loses water of crystallization, first forming the pentahydrate and then anhydrous sodium tetraborate. |
| Decomposition | When heated to decomposition it emits toxic fumes of /sodium oxide and boron/. |
| Corrosivity | Solutions are not a corrosion hazard to ferrous metals. |
| pH | pH at 20 °C: 9.3 (0.1% solution); 9.2 (1.0% solution) |
| Refractive Index | Index of refraction: 1.447 (alpha); 1.469 (beta); 1.472 (gamma) |
| Other Experimental Properties | A 2.6% solution is iso-osmotic with serum |
| Chemical Classes | Metals -> Metalloid Compounds (Boron) |
SAFETY INFORMATION
| Signal word | Danger |
|---|---|
| Pictogram(s) |
 Exclamation Mark Irritant GHS07  Health Hazard GHS08 |
| GHS Hazard Statements |
H319:Serious eye damage/eye irritation |
| Precautionary Statement Codes |
P202:Do not handle until all safety precautions have been read and understood. P264:Wash hands thoroughly after handling. P264:Wash skin thouroughly after handling. P280:Wear protective gloves/protective clothing/eye protection/face protection. P305+P351+P338:IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing. P308+P313:IF exposed or concerned: Get medical advice/attention. P337+P313:IF eye irritation persists: Get medical advice/attention. |
COMPUTED DESCRIPTORS
| Molecular Weight | 381.4 g/mol |
|---|---|
| Hydrogen Bond Donor Count | 10 |
| Hydrogen Bond Acceptor Count | 17 |
| Rotatable Bond Count | 0 |
| Exact Mass | 382.0868084 g/mol |
| Monoisotopic Mass | 382.0868084 g/mol |
| Topological Polar Surface Area | 102 Ų |
| Heavy Atom Count | 23 |
| Formal Charge | 0 |
| Complexity | 121 |
| Isotope Atom Count | 0 |
| Defined Atom Stereocenter Count | 0 |
| Undefined Atom Stereocenter Count | 0 |
| Defined Bond Stereocenter Count | 0 |
| Undefined Bond Stereocenter Count | 0 |
| Covalently-Bonded Unit Count | 13 |
| Compound Is Canonicalized | Yes |
PRODUCT INTRODUCTION
description
Borax is a mineral with formula of Na2B4O5(OH)4·8H2O. The IMA symbol is Brx.