Silver chromate information

Silver chromate
Names
	IUPAC name Silver chromate
	Other names Silver chromate(VI); Silver(I) chromate
Identifiers
CAS Number	7784-01-2 ;
3D model (JSmol)	Interactive image;
ChemSpider	56417 ;
ECHA InfoCard	100.029.130
EC Number	232-043-8;
PubChem CID	62666;
UNII	ZJ5092LWU9 ;
	InChI InChI=1S/2Ag.Cr.4O/q2+1;;;;2-1 Key: OJKANDGLELGDHV-UHFFFAOYSA-N ; InChI=1/2Ag.Cr.4O/q2+1;;;;2-1/r2Ag.CrO4/c;;2-1(3,4)5/q2+1;-2 Key: OJKANDGLELGDHV-SCAQNZDMAQ; InChI=1S/2Ag.Cr.4O/q2+1;;;;2*-1 Key: OJKANDGLELGDHV-UHFFFAOYSA-N;
	SMILES [Ag+].[Ag+].[O-][Cr]([O-])(=O)=O;
Properties
Chemical formula	Ag2CrO4
Molar mass	331.73 g/mol
Appearance	brick-red powder
Density	5.625 g/cm3
Melting point	665 °C (1,229 °F; 938 K)
Boiling point	1,550 °C (2,820 °F; 1,820 K)
Solubility in water	0.14 mg/L (0 °C)
Solubility product (Ksp)	1.12×10−12
Solubility	soluble in nitric acid, ammonia, alkali cyanides and chromates
UV-vis (λmax)	450 nm (22200 cm−1)
Magnetic susceptibility (χ)	−40.0·10−6 cm3/mol
Refractive index (nD)	2.2 (630 nm)
Structure
Crystal structure	orthorhombic (T<482 °C); hexagonal (T>482 °C)
Space group	Pnma, № 62 (low T form)
Lattice constant	a = 10.063 Å, b = 7.029 Å, c = 5.540 Å
Formula units (Z)	4
Thermochemistry
Heat capacity (C)	142.3 J·mol−1·K−1
Std molar; entropy (S⦵298)	217.6 J·mol−1·K−1
Std enthalpy of; formation (ΔfH⦵298)	−731.7 kJ·mol−1
Gibbs free energy (ΔfG⦵)	−641.8 kJ·mol−1
Hazards
	Occupational safety and health (OHS/OSH):
Main hazards	carcinogenic, oxidiser, environmental hazard
	GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H272, H317, H350, H410
Precautionary statements	P201, P210, P273, P280, P302+P353, P308+P313
Related compounds
Other anions	Silver nitrate; Silver chloride; Silver thiocyanate
Other cations	Potassium chromate; Ammonium chromate; Lead(II) chromate
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) Infobox references

Silver chromate is an inorganic compound with formula Ag₂CrO₄ which appears as distinctively coloured brown-red crystals. The compound is insoluble and its precipitation is indicative of the reaction between soluble chromate and silver precursor salts (commonly potassium/sodium chromate with silver nitrate).^[5]^[7]^[8] This reaction is important for two uses in the laboratory: in analytical chemistry it constitutes the basis for the Mohr method of argentometry,^[9] whereas in neuroscience it is used in the Golgi method of staining neurons for microscopy.^[10]

In addition to the above, the compound has been tested as a photocatalyst for wastewater treatment.^[7] The most important practical and commercial application for silver chromate, however, is its use in Li-Ag₂CrO₄ batteries, a type of lithium battery mainly found in artificial pacemaker devices.^[11]

As for all chromates, which are chromium(VI) species, the compound poses a hazard of toxicity, carcinogenicity and genotoxicity, as well as great environmental harm.

^ ^a ^b ^c Haynes, p. 4.84
^ Haynes, p. 5.178
^ Patnaik, Pradyot (2002). Handbook of Inorganic Chemicals. McGraw-Hill. ISBN 0-07-049439-8
^ Haynes, p. 4.130
^ ^a ^b Cite error: The named reference Hackert was invoked but never defined (see the help page).
^ Haynes, p. 5.35
^ ^a ^b Cite error: The named reference :0 was invoked but never defined (see the help page).
^ Cite error: The named reference :1 was invoked but never defined (see the help page).
^ Belcher, R.; Macdonald, A. M. G.; Parry, E. (1957-01-01). "On Mohr's method for the determination of chlorides". Analytica Chimica Acta. 16: 524–529. Bibcode:1957AcAC...16..524B. doi:10.1016/S0003-2670(00)89979-1.
^ Kang, Hee Won; Kim, Ho Kyu; Moon, Bae Hun; Lee, Seo Jun; Lee, Se Jung; Rhyu, Im Joo (2017-06-30). "Comprehensive Review of Golgi Staining Methods for Nervous Tissue". Applied Microscopy. 47 (2): 63–69. doi:10.9729/AM.2017.47.2.63.
^ Lehmann, G.; Broussely, M.; Lenfant, P. (1978), Thalen, Hilbert J. Th.; Harthorne, J. Warren (eds.), "The Saft Lithium — Silver Chromate Battery Performances of the LI 210 Type", To Pace or not to Pace: Controversial Subjects in Cardiac Pacing, Dordrecht: Springer Netherlands, pp. 109–115, doi:10.1007/978-94-009-9723-3_18, ISBN 978-94-009-9723-3

[r1-1] Haynes, p. 4.84

[r2-2] Haynes, p. 5.178

[3] Patnaik, Pradyot (2002). Handbook of Inorganic Chemicals. McGraw-Hill. ISBN 0-07-049439-8

[4] Haynes, p. 4.130

[Hackert-5] Cite error: The named reference Hackert was invoked but never defined (see the help page).

[6] Haynes, p. 5.35

[:0-7] Cite error: The named reference :0 was invoked but never defined (see the help page).

[:1-8] Cite error: The named reference :1 was invoked but never defined (see the help page).

[:3-9] Belcher, R.; Macdonald, A. M. G.; Parry, E. (1957-01-01). "On Mohr's method for the determination of chlorides". Analytica Chimica Acta. 16: 524–529. Bibcode:1957AcAC...16..524B. doi:10.1016/S0003-2670(00)89979-1.

[:4-10] Kang, Hee Won; Kim, Ho Kyu; Moon, Bae Hun; Lee, Seo Jun; Lee, Se Jung; Rhyu, Im Joo (2017-06-30). "Comprehensive Review of Golgi Staining Methods for Nervous Tissue". Applied Microscopy. 47 (2): 63–69. doi:10.9729/AM.2017.47.2.63.

[:2-11] Lehmann, G.; Broussely, M.; Lenfant, P. (1978), Thalen, Hilbert J. Th.; Harthorne, J. Warren (eds.), "The Saft Lithium — Silver Chromate Battery Performances of the LI 210 Type", To Pace or not to Pace: Controversial Subjects in Cardiac Pacing, Dordrecht: Springer Netherlands, pp. 109–115, doi:10.1007/978-94-009-9723-3_18, ISBN 978-94-009-9723-3

Silver chromate information

and 28 Related for: Silver chromate information

Silver chromate

Potassium chromate

Argentometry

Chromate conversion coating

Neuroanatomy

Potassium dichromate

Camillo Golgi

Neuroscience

Plating

Staining

List of inorganic compounds

Liesegang rings

Solubility table

Cadmium chromate

History of neuroscience

List of CAS numbers by chemical compound

Lithium metal battery

Carbon print

Glossary of chemical formulae

Chromium

Crocoite

Neuronal lineage marker

List of Spanish inventors and discoverers

Silver dichromate

Luis Simarro Lacabra

List of alchemical substances

Corrosion

Chromic acid

Names


IUPAC name Silver chromate
Other names Silver chromate(VI) Silver(I) chromate
Identifiers
CAS Number	7784-01-2^N
3D model (JSmol)	Interactive image
ChemSpider	56417^Y
ECHA InfoCard	100.029.130
EC Number	232-043-8
PubChem CID	62666
UNII	ZJ5092LWU9^Y
InChI InChI=1S/2Ag.Cr.4O/q2+1;;;;2-1^Y Key: OJKANDGLELGDHV-UHFFFAOYSA-N^Y InChI=1/2Ag.Cr.4O/q2+1;;;;2-1/r2Ag.CrO4/c;;2-1(3,4)5/q2+1;-2 Key: OJKANDGLELGDHV-SCAQNZDMAQ InChI=1S/2Ag.Cr.4O/q2+1;;;;2*-1 Key: OJKANDGLELGDHV-UHFFFAOYSA-N
SMILES [Ag+].[Ag+].[O-][Cr]([O-])(=O)=O
Properties
Chemical formula	Ag₂CrO₄
Molar mass	331.73 g/mol
Appearance	brick-red powder^[1]
Density	5.625 g/cm³^[1]
Melting point	665 °C (1,229 °F; 938 K)
Boiling point	1,550 °C (2,820 °F; 1,820 K)
Solubility in water	0.14 mg/L (0 °C)^[1]
Solubility product (K_sp)	1.12×10⁻¹²^[2]
Solubility	soluble in nitric acid, ammonia, alkali cyanides and chromates^[3]
UV-vis (λ_max)	450 nm (22200 cm⁻¹)
Magnetic susceptibility (χ)	−40.0·10⁻⁶ cm³/mol^[4]
Refractive index (n_D)	2.2 (630 nm)
Structure^[5]
Crystal structure	orthorhombic (T<482 °C) hexagonal (T>482 °C)
Space group	Pnma, № 62 (low T form)
Lattice constant	a = 10.063 Å, b = 7.029 Å, c = 5.540 Å
Formula units (Z)	4
Thermochemistry^[6]
Heat capacity (C)	142.3 J·mol⁻¹·K⁻¹
Std molar entropy (S^⦵₂₉₈)	217.6 J·mol⁻¹·K⁻¹
Std enthalpy of formation (Δ_fH^⦵₂₉₈)	−731.7 kJ·mol⁻¹
Gibbs free energy (Δ_fG^⦵)	−641.8 kJ·mol⁻¹
Hazards
Occupational safety and health (OHS/OSH):
Main hazards	carcinogenic, oxidiser, environmental hazard
GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H272, H317, H350, H410
Precautionary statements	P201, P210, P273, P280, P302+P353, P308+P313
Related compounds
Other anions	Silver nitrate Silver chloride Silver thiocyanate
Other cations	Potassium chromate Ammonium chromate Lead(II) chromate
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