Beryllium sulfate

Beryllium sulfate normally encountered as the tetrahydrate, [Be(H₂O)₄]SO₄ is a white crystalline solid. It was first isolated in 1815 by Jons Jakob Berzelius.^[4] Beryllium sulfate may be prepared by treating an aqueous solution of many beryllium salts with sulfuric acid, followed by evaporation of the solution and crystallization. The hydrated product may be converted to anhydrous salt by heating at 400 °C.^[5]

Beryllium sulfate

Identifiers
CAS Number	13510-49-1 Y 7787-56-6 (tetrahydrate) Y
3D model (JSmol)	anhydrous: Interactive image tetrahydrate: Interactive image
ChEBI	CHEBI:53473 Y
ChemSpider	24291 Y
ECHA InfoCard	100.033.478
EC Number	236-842-2
PubChem CID	26077
RTECS number	DS4800000
UNII	01UQ1KPC7E Y 2TYK3LF8ZN (tetrahydrate) Y
CompTox Dashboard (EPA)	DTXSID0020159
InChI InChI=1S/Be.H2O4S/c;1-5(2,3)4/h;(H2,1,2,3,4)/q+2;/p-2 Y Key: KQHXBDOEECKORE-UHFFFAOYSA-L Y InChI=1/Be.H2O4S/c;1-5(2,3)4/h;(H2,1,2,3,4)/q+2;/p-2 Key: KQHXBDOEECKORE-NUQVWONBAA
SMILES anhydrous: [Be+2].[O-]S([O-])(=O)=O tetrahydrate: [OH2+][Be-2]([OH2+])([OH2+])[OH2+].[O-]S([O-])(=O)=O
Properties[1]
Chemical formula	BeSO4
Molar mass	105.075 g/mol (anhydrous) 177.136 g/mol (tetrahydrate)
Appearance	white solid
Odor	odorless
Density	2.44 g/cm3 (anhydrous) 1.71 g/cm3 (tetrahydrate)
Melting point	110 °C (230 °F; 383 K) (tetrahydrate, −2H2O) 400 °C (dihydrate, dehydr.) 550–600 decomposes
Boiling point	2,500 °C (4,530 °F; 2,770 K) (anhydrate) 580 °C (tetrahydrate)
Solubility in water	36.2 g/100 mL (0 °C) 40.0 g/100 mL (20 °C) 54.3 g/100 mL (60 °C)
Solubility	insoluble in alcohol
Refractive index (nD)	1.4374 (tetrahydrate)
Thermochemistry
Std molar entropy (S⦵298)	90 J/mol K
Std enthalpy of formation (ΔfH⦵298)	-1197 kJ/mol
Gibbs free energy (ΔfG⦵)	-1088 kJ/mol
Hazards
GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H301, H315, H317, H319, H330, H335, H350, H372, H411
Flash point	Non-flammable
Lethal dose or concentration (LD, LC):
LD50 (median dose)	82 mg/kg (rat, oral) 80 mg/kg (mouse, oral)[2]
NIOSH (US health exposure limits):
PEL (Permissible)	TWA 0.002 mg/m3 C 0.005 mg/m3 (30 minutes), with a maximum peak of 0.025 mg/m3 (as Be)[3]
REL (Recommended)	Ca C 0.0005 mg/m3 (as Be)[3]
IDLH (Immediate danger)	Ca [4 mg/m3 (as Be)][3]
Safety data sheet (SDS)	ICSC 1351
Related compounds
Other cations	Magnesium sulfate Calcium sulfate Strontium sulfate Barium sulfate
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). N verify (what is YN ?) Infobox references

Structure

According to X-ray crystallography the tetrahydrate contains a tetrahedral Be(OH₂)₄²⁺ unit and sulfate anions. The small size of the Be²⁺ cation determines the number of water molecules that can be coordinated.^[6] In contrast, the analogous magnesium salt, MgSO₄·6H₂O contains an octahedral Mg(OH₂)₆²⁺ unit.^[7] The existence of the tetrahedral [Be(OH₂)₄]²⁺ ion in aqueous solutions of beryllium nitrate and beryllium chloride has been confirmed by vibrational spectroscopy, as indicated by the totally symmetric BeO4 mode attt 531 cm⁻¹. This band is absent in beryllium sulfate, and the sulfate modes are perturbed. The data support the existence of Be(OH₂)₃OSO₃.^[8]

The anhydrous compound has a structure similar to that of boron phosphate. The structure contains alternating tetrahedrally coordinated Be and S and each oxygen is 2 coordinate (Be-O-S). The Be-O distance is 156 pm and the S-O distance is 150 pm.^[9]

A mixture of beryllium and radium sulfate was used as the neutron source in the discovery of nuclear fission.

References

1. Weast, Robert C., ed. (1981). CRC Handbook of Chemistry and Physics (62nd ed.). Boca Raton, Florida: CRC Press. p. B-82. ISBN 0-8493-0462-8..
2. "Beryllium compounds (as Be)". Immediately Dangerous to Life or Health Concentrations (IDLH). National Institute for Occupational Safety and Health (NIOSH).
3. NIOSH Pocket Guide to Chemical Hazards. "#0054". National Institute for Occupational Safety and Health (NIOSH).
4. Lathrop Parsons, Charles (1909), The Chemistry and Literature of Beryllium, London, pp. 29–33, ISBN 9780559264160{{citation}}: CS1 maint: location missing publisher (link).
5. Patnaik, Pradyot (2002), Handbook of Inorganic Chemicals, McGraw-Hill, ISBN 0-07-049439-8.
6. Kellersohn, T.; Delaplane, R. G.; Olovsson, I. (1994). "The synergetic effect in beryllium sulfate tetrahydrate – an experimental electron-density study". Acta Crystallographica Section B: Structural Science. 50 (3): 316–326. doi:10.1107/S010876819400039X.
7. Wells A.F. (1984) Structural Inorganic Chemistry 5th edition Oxford Science Publications ISBN 0-19-855370-6
8. Rudolph, Wolfram W.; Fischer, Dieter; Irmer, Gert; Pye, Cory C. (2009). "Hydration of Beryllium(II) in Aqueous Solutions of Common Inorganic Salts. A Combined Vibrational Spectroscopic and ab initio Molecular Orbital Study". Dalton Transactions (33): 6513–6527. doi:10.1039/B902481F. PMID 19672497.
9. Grund, Alfred (1955). "Die Kristallstruktur von BeSO4". Tschermaks Mineralogische und Petrographische Mitteilungen. 5 (3): 227–230. Bibcode:1955MinPe...5..227G. doi:10.1007/BF01191066. ISSN 0041-3763.

External links

• International Chemical Safety Card 1351
• IARC Monograph "Beryllium and Beryllium Compounds"
• IPCS Health & Safety Guide 44
• IPCS Environmental Health Criteria 106: Beryllium
• IPCS CICAD 32