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13460-50-9
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???(??):
?????;?????(METABORICACID);???
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METABORIC ACID
???(??):
BHO2;HBO2;METABORIC ACID;Hydroxyoxoboron;boricacid(hbo2);Boric acid (HBO2);Metaboric acid 99%;meta-BORIC ACID Extra Pure;Meta-Boric Acid 98.5% Extra Pure
CBNumber:
CB2360089
???:
BHO2
??? ??:
43.82
MOL ??:
13460-50-9.mol

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236°C
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1390 °C
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2.49 g/mL at 25 °C(lit.)
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soluble in H2O
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??? H2O
CAS ??????
13460-50-9
EPA
Boric acid (HBO2) (13460-50-9)
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  • ?? ? ?? ??
  • ?? ? ???? ?? (GHS)
??? ?? Xi
?? ???? ?? 36/37/38
????? 26-36
WGK ?? 3
???? ?? KE-23136
????(GHS): GHS hazard pictograms
?? ?: Warning
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?? ??·?? ?? ?? ?? ?? ?? ? ?? ?? P- ??
H315 ??? ??? ??? ????? ?? ????? ?? 2 ?? GHS hazard pictograms P264, P280, P302+P352, P321,P332+P313, P362
H319 ?? ?? ??? ??? ?? ? ?? ?? ??? ?? ?? 2A ?? GHS hazard pictograms P264, P280, P305+P351+P338,P337+P313P
H335 ?? ???? ??? ? ?? ?? ???? ?? - 1? ??;???? ?? ?? 3 ?? GHS hazard pictograms
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P261 ??·?·??·???·??·...·????? ??? ????.
P305+P351+P338 ?? ??? ? ?? ?? ???? ????. ???? ?????? ?????. ?? ????.

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White crystals. Slightly soluble in water.

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Metaboric can be prepared in three crystal forms; orthorhombic α, monoclinic β, cubic γ. 1 Detailed study of the monoclinic and cubic structures of the acid has been reported. Metaboric acid can be obtained by heating boric acid at 120oC for 4h.

Synthesis

Metaboric acid occurs when H3BO3 is heated to 80-100°C for several days, either in an oven or in a dry air stream, until the calculated amount of water has been removed.

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