Potassium dihydrogen arsenate

Crystal structure
	__ K __ As __ H __ O
Crystal system	tetragonal
Space group	I 4 2 d (No. 122)
Lattice parameters	a = 7.634 Å , c = 7.166 Å , Z = 4
General
Surname	Potassium dihydrogen arsenate
other names	Potassium arsenate
Ratio formula	KH 2 AsO 4
Brief description	colorless solid
External identifiers / databases
EC number	232-065-8
ECHA InfoCard	100.029.150
PubChem	516881
Wikidata	Q2660286
properties
Molar mass	180.02 g mol −1
Physical state	firmly
density	2.867 g cm −3
Melting point	288 ° C
solubility	Easily soluble in water (190 g l −1 at 6 ° C); practically insoluble in ethanol;
safety instructions
H and P phrases	H: 301-331-350-410
	P: 201-261-273-301 + 310-311-501
	As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Potassium dihydrogen arsenate is an inorganic chemical compound of potassium from the group of arsenates .

Extraction and presentation

Potassium dihydrogen arsenate can be obtained by reacting potassium carbonate with arsenic (V) oxide .

{\ displaystyle {\ ce {K2CO3 + As2O5 + 2H2O -> 2KH2AsO4 + CO2 ^}}}

properties

Potassium dihydrogen arsenate is a colorless solid that is easily soluble in water. It has a tetragonal crystal structure with the space group I 4 2 d (space group no. 122) . Template: room group / 122

The dehydration of potassium dihydrogen arsenate at around 400 ° C produces potassium metaarsenate KAsO ₃ .

use

Potassium dihydrogen arsenate can be used as a reference material in the analysis of biological materials for the presence of arsenate and as a metabolic inhibitor and toxicity agent. It is also used to make fly paper and as an insecticide .

Individual evidence

↑ ^a ^b ^c Tatsuki Miyoshi, Tomoshi Akimoto, Hiroyuki Mashiyama: Hydrogen Atom of KH ₂ AsO ₄ Determined by Neutron Diffraction Study . In: Journal of the Physical Society of Japan . tape 80 , 2011, p. 074607 , doi : 10.1143 / JPSJ.80.074607 .
↑ ^a ^b ^c ^d ^e ^f ^g ^h Entry on potassium dihydrogen arsenate in the GESTIS substance database of the IFA , accessed on January 1, 2018(JavaScript required) .
^ ^A ^b Michael D. Larrañaga, Richard J. Lewis, Robert A. Lewis: Hawley's Condensed Chemical Dictionary . John Wiley & Sons, 2016, ISBN 978-1-118-13515-0 , pp. 1514 ( limited preview in Google Book search).
^ ^A ^b D. HW Dickson, AR Ubbelohde: The hydrogen bond in crystals. VIII. The isotope effect in KH2AsO4. In: Acta Crystallographica. 3, 1950, p. 6, doi : 10.1107 / S0365110X50000021 .
↑ R. Blachnik: Pocket book for chemists and physicists Volume 3: Elements, inorganic compounds and materials, minerals . Springer-Verlag, 2013, ISBN 978-3-642-58842-6 , pp. 500 ( limited preview in Google Book Search).
↑ Data sheet Potassium arsenate monobasic from Sigma-Aldrich , accessed on January 1, 2018 ( PDF ).
^ Stanley A. Greene: Sittig's Handbook of Pesticides and Agricultural Chemicals . William Andrew, 2013, ISBN 978-0-8155-1903-4 , pp. 1187 ( limited preview in Google Book search).

[DOI10.1143/JPSJ.80.074607-1] Tatsuki Miyoshi, Tomoshi Akimoto, Hiroyuki Mashiyama: Hydrogen Atom of KH ₂ AsO ₄ Determined by Neutron Diffraction Study . In: Journal of the Physical Society of Japan . tape 80 , 2011, p. 074607 , doi : 10.1143 / JPSJ.80.074607 .

[GESTIS-2] ↑ ^a ^b ^c ^d ^e ^f ^g ^h Entry on potassium dihydrogen arsenate in the GESTIS substance database of the IFA , accessed on January 1, 2018(JavaScript required) .

[Michael_D._Larrañaga,_Richard_J._Lewis,_Robert_A._Lewis-3] A ^b Michael D. Larrañaga, Richard J. Lewis, Robert A. Lewis: Hawley's Condensed Chemical Dictionary . John Wiley & Sons, 2016, ISBN 978-1-118-13515-0 , pp. 1514 ( limited preview in Google Book search).

[DOI10.1107/S0365110X50000021-4] A ^b D. HW Dickson, AR Ubbelohde: The hydrogen bond in crystals. VIII. The isotope effect in KH2AsO4. In: Acta Crystallographica. 3, 1950, p. 6, doi : 10.1107 / S0365110X50000021 .

[R._Blachnik-5] R. Blachnik: Pocket book for chemists and physicists Volume 3: Elements, inorganic compounds and materials, minerals . Springer-Verlag, 2013, ISBN 978-3-642-58842-6 , pp. 500 ( limited preview in Google Book Search).

[Sigma-6] Data sheet Potassium arsenate monobasic from Sigma-Aldrich , accessed on January 1, 2018 ( PDF ).

[Stanley_A._Greene-7] Stanley A. Greene: Sittig's Handbook of Pesticides and Agricultural Chemicals . William Andrew, 2013, ISBN 978-0-8155-1903-4 , pp. 1187 ( limited preview in Google Book search).