Sodium pentaborate

General
Surname	Sodium pentaborate
other names	Sodium pentaboroctoxide
Molecular formula	NaB 5 O 8
Brief description	colorless and odorless solid
External identifiers / databases
ECHA InfoCard	100,031,371
PubChem	57349668
Wikidata	Q15836384
properties
Molar mass	205.04 g mol −1
Melting point	> 500 ° C
solubility	soluble in water (pentahydrate: 9.24 g l −1 at 0 ° C)
safety instructions
GHS labeling of hazardous substances Caution
H and P phrases	H: 361d
	P: ?
Toxicological data	2400 mg kg −1 ( LD 50 , rat , oral )
	As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Sodium pentaborate is an inorganic chemical compound of sodium from the group of borates .

Occurrence

Sodium pentaborate pentahydrate occurs naturally in the form of the mineral sborgite .

Extraction and presentation

The pentahydrate of sodium pentaborate can be obtained by reacting borax with boric acid .

{\ displaystyle \ mathrm {Na_ {2} B_ {4} O_ {7} \ cdot 10 \ H_ {2} O + 6 \ H_ {3} BO_ {3} \ longrightarrow 2 \ NaB_ {5} O_ {8} \ cdot 5 \ H_ {2} O + 9 \ H_ {2} O}}

properties

Sodium pentaborate pentahydrate crystallizes triclinically, in oblique truncated prisms.

use

Sodium pentaborate is used in emergency nuclear reactors as a backup system for normal regulation. In the event of an accident, a highly concentrated sodium pentaborate solution is introduced into the reactor, after which the chain reaction is slowed down by the neutron-absorbing effect .

Individual evidence

↑ ^a ^b ^c Entry on sodium pentaborate in the GESTIS substance database of the IFA , accessed on July 10, 2016(JavaScript required) .
↑ ^a ^b Georg Brauer (Ed.), With the collaboration of Marianne Baudler u a .: Handbook of Preparative Inorganic Chemistry. 3rd, revised edition. Volume I, Ferdinand Enke, Stuttgart 1975, ISBN 3-432-02328-6 , p. 810.
↑ mycrobor: MSDS ( Memento of the original from February 23, 2014 in the Internet Archive ) Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice. @1@ 2
^ Yoshiaki Oka, Katsuo Suzuki: Nuclear Reactor Kinetics and Plant Control . Springer Science & Business Media, 2013, ISBN 978-4-431-54195-0 , pp. 134 ( Google Books ).

[GESTIS-1] Entry on sodium pentaborate in the GESTIS substance database of the IFA , accessed on July 10, 2016(JavaScript required) .

[brauer-2] Georg Brauer (Ed.), With the collaboration of Marianne Baudler u a .: Handbook of Preparative Inorganic Chemistry. 3rd, revised edition. Volume I, Ferdinand Enke, Stuttgart 1975, ISBN 3-432-02328-6 , p. 810.

[mycrobor-3] ycrobor: MSDS ( Memento of the original from February 23, 2014 in the Internet Archive ) Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice. @1@ 2

[4] Yoshiaki Oka, Katsuo Suzuki: Nuclear Reactor Kinetics and Plant Control . Springer Science & Business Media, 2013, ISBN 978-4-431-54195-0 , pp. 134 ( Google Books ).