Sodium molybdate

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Structural formula
2Sodium ionMolybdenum
General
Surname Sodium molybdate
other names
  • Disodium molybdate
  • Natrii molybdas dihydricus
Molecular formula Na 2 MoO 4
Brief description

white odorless solid

External identifiers / databases
CAS number
  • 7631-95-0
  • 10102-40-6 (dihydrate)
EC number 231-551-7
ECHA InfoCard 100,028,683
PubChem 61424
Wikidata Q414518
properties
Molar mass 205.92 g mol −1

241.95 g mol −1 (dihydrate)

Physical state

firmly

density
  • 3.72 g cm −3
  • 2.37 g cm −3 (dihydrate)
Melting point
  • 687 ° C
  • 100 ° C (dihydrate)
solubility
  • easily in water (650 g l −1 at 20 ° C)
  • easily in water (560 g l −1 at 0 ° C)
safety instructions
GHS labeling of hazardous substances
no GHS pictograms
H and P phrases H: no H-phrases
P: no P-phrases
Toxicological data
  • 4000 mg kg −1 ( LD 50 ,  rat ,  oral )
  • > 2.08 mg l −1 ( LC 50 ,  rat , inhalation, 4 h )
  • 1320 mg l −1 ( LC 50 ,  fish , 96 h , median value)
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Sodium molybdate with the empirical formula Na 2 MoO 4 is a chemical compound from the group of molybdates , which often occurs as dihydrate and decahydrate. It is the sodium salt of molybdic acid .

Extraction and presentation

Sodium molybdate was first synthesized by hydration. A better known synthesis is the dissolving of molybdenum trioxide in caustic soda at 50–70 ° C. The anhydrous salt is produced by heating to more than 130 ° C.

Production by melting molybdenum trioxide with sodium carbonate is also possible.

properties

Sodium molybdate is a white, odorless solid and forms hydrated, shiny, water-soluble crystals. The decomposition temperature is 130 ° C. Sodium borohydride reduces the central molybdenum atom to a lower oxidation state.

use

Sodium molybdate is used as an analytical reagent for alkaloids , for the production of pigments and in medicine as an additive in tube feeding and for the production of other molybdenum compounds. In agriculture, large amounts are used as fertilizer.

Individual evidence

  1. ↑ a b c d e f g h i Entry on sodium molybdate in the GESTIS substance database of the IFA , accessed on December 22, 2019 (JavaScript required)
  2. ↑ a b Data sheet Sodium molybdate dihydrate, ≥99.5% from Sigma-Aldrich , accessed on May 15, 2017 ( PDF ).
  3. ↑ Entry on sodium molybdate at ChemBlink , accessed on September 30, 2012.
  4. ↑ External identifiers or database links for sodium molybdate dihydrate : CAS number: 10102-40-6, EC number: 600-158-6, ECHA InfoCard: 100.133.776 , PubChem : 16211258 , ChemSpider : 10607845 , Wikidata : Q27145167 .
  5. ↑ Spitsyn, Vikt. I .; Kuleshov, IM Zhurnal Obshchei Khimii , 1951 , 21 , pp. 1701-1715.
  6. ^ ER Braithwaite, J. Haber: Molybdenum: An outline of its Chemistry and Uses. Elsevier Science BV Amsterdam 1994.
  7. ↑ Sodium molybdate data sheet (PDF) from Merck , accessed on July 6, 2010.
  8. ^ Hermann Hager, Franz von Bruchhausen: Hager's handbook of pharmaceutical practice . Volume 5; ISBN 978-3-5406-2646-6 , p. 283.
  9. ↑ Chi Fo Tsang and Arumugam Manthiram. Journal of Materials Chemistry , 1997 , 7  (6), pp. 1003-1006.
  10. ↑ Sodium molybdate dihydrate data sheet (PDF) from Carl Roth , accessed on June 25, 2011.
  11. ↑ Product information Fresubin
  12. ^ W. Plant: Use of Lime and Sodium Molybdate for the Control of 'Whiptail' in Broccoli. In: Nature . 1950, 165, p. 533, doi : 10.1038 / 165533b0 .
  13. ^ EB Davies: A Case of Molybdenum Deficiency in New Zealand. In: Nature . 1945, 165, p. 392, doi : 10.1038 / 156392b0 .