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| Subject : Sodium Metaborate |
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| Post Date : 6th July 2009 |
| Expiry date : 6th July 2010 |
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| Description |
We offer Sodium Metaborate.
Borates in chemistry are chemical compounds containing boron bonded to three oxygen atoms written as B(OR)3. In B(OR)4− anions, this number increases to four.
The borate ion is BO33−. it forms salts with metallic elements. Boron found in nature is commonly as a borate mineral. Boron is also found combined with silicate to form complex borosilicate minerals such as the tourmalines.
Borate exists in many forms. In acid and near-neutral conditions, it is boric acid, commonly written as H3BO3 but more correctly B(OH)3. The pKa of boric acid is 9.14 at 25C. Boric acid does not dissociate in aqueous solution, but is acidic due to its interaction with water molecules, forming tetrahydroxyborate:
B(OH)3+H2O.B(OH)4+H+
Ka=5.8x10−10 mol/l; pKa=9.24.
Polyborate anions are formed at pH 7–10 if the boron concentration is higher than about 0.025 mol/L. The best known of these is the tetraborate ion, found in the mineral borax:
4B(OH)4− + 2H+ B4O72− + 9H2O
Even though boric acid adds hydroxide to form B(OH)4−, you may find for pKa values and other calculations, the fictitious ions are easier to use. Thus for a typical polyprotic acid, the deprotonation series dihydrogen borate [H2BO3], hydrogen borate [HBO32] and borate [BO33] may be written as pH increases.
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| Contact Information |
| TRIVENI CHEMICALS |
135, PANCHARATNA, CHAR RASTA, G.I.D.C.,
Vapi - 396195, Gujarat, India
Phone:91-260-2400022/3264008/3264412/6640218/6640243
Fax:91-260-2400022/3264008/3264412/6640218/6640243
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| Key Personnel |
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Mr. K. K. Singh
(C.E.O.)
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Mobile : +919227788104
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