砷酸二氢钾

砷酸二氢钾
别名	Macquer's salt; 砷酸一钾
识别
CAS号	7784-41-0
PubChem	516881
ChemSpider	22977
SMILES	O[As](=O)(O)[O-].[K+];
UN编号	1677
性质
化学式	KH2AsO4
摩尔质量	180.032 g·mol⁻¹
外观	白色固体
密度	2.867 g/cm3
熔点	288 °C（561 K）
危险性
	GHS危险性符号;
GHS提示词	危险
H-术语	H301, H331, H350, H400, H410
P-术语	P201, P202, P261, P264, P270, P271, P273, P281, P301+310, P304+340, P308+313, P311, P321, P330
	若非注明，所有数据均出自标准状态（25 ℃，100 kPa）下。

砷酸二氢钾是一种无机化合物，化学式为KH₂AsO₄。它可由碳酸钾和五氧化二砷在水中反应制得。^[2]

砷酸二氢钾在400 °C分解，生成偏砷酸钾。^[2]它和硫化氢在pH 7.2~8时反应，可以得到KH₂AsO₃S。^[3]它和三氟化锑反应，可以得到K(SbF₂)HAsO₄。^[4]它和氢氟酸（40%）发生放热反应，生成K[AsF₅OH]。^[5]它和镁盐在溶液中反应，形成KMgAsO₄·6H₂O沉淀。^[6]

参考文献

^ "Hazardous Substances Data Bank" data were obtained from the National Library of Medicine (US). Retrieved from SciFinder. [2021-03-26].
^ ^2.0 ^2.1 D. H. W. Dickson, A. R. Ubbelohde. The hydrogen bond in crystals. VIII. The isotope effect in KH₂AsO₄. Acta Crystallographica. 1950-01-01, 3 (1): 6–9 [2021-03-26]. ISSN 0365-110X. doi:10.1107/S0365110X50000021. （原始内容存档于2018-06-03）.
^ Rakhimov, K.; Zhigarnovskii, B. M.; Polyakov, Yu. A.; Bugakov, V. I.; Orlovskii, V. P.; Kozhenkov, V. Yu.; Abdullaeva, M. I. Synthesis and investigation of the physicochemical properties of hydrothioarsenates of potassium, rubidium, and cesium（俄文）. Izvestiya Akademii Nauk SSSR, Neorganicheskie Materialy, 1987. 23 (10): 1691-1695. ISSN: 0002-337X.
^ K. Holz, R. Mattes. Verbindungen des Antimon(III) mit SbFnOm-Koordinationsspähre Kristallstrukturen von K(SbF₂)HAsO₄, NH₄(SbF₂)HAsO₄ und Sb₃O₂F₅. Zeitschrift für anorganische und allgemeine Chemie. 1989, 578 (1): 133–142 [2021-03-26]. ISSN 0044-2313. doi:10.1002/zaac.19895780115 （德语）.
^ Lothar Kolditz. Herbert W. Roesky , 编. Fluoro and Fluorohydroxy Complexes of As, Sb, and Sn. Hoboken, NJ, USA: John Wiley & Sons, Inc. 2012-10-14: 117–120 [2021-03-26]. ISBN 9781118409466. doi:10.1002/9781118409466.ch20 （英语）.
^ Zuldjevat Abdija, Metodija Najdoski, Violeta Koleva, Tomče Runčevski, Robert E. Dinnebier, Bojan Šoptrajanov, Viktor Stefov. Preparation, Structural, Thermogravimetric and Spectroscopic Study of Magnesium Potassium Arsenate Hexahydrate: Preparation of Magnesium Potassium Arsenate Hexahydrate. Zeitschrift für anorganische und allgemeine Chemie. 2014-12, 640 (15): 3177–3183 [2021-03-26]. doi:10.1002/zaac.201400265 （英语）.

[1] "Hazardous Substances Data Bank" data were obtained from the National Library of Medicine (US). Retrieved from SciFinder. [2021-03-26].

[Dickson-2] 2.0 ^2.1 D. H. W. Dickson, A. R. Ubbelohde. The hydrogen bond in crystals. VIII. The isotope effect in KH₂AsO₄. Acta Crystallographica. 1950-01-01, 3 (1): 6–9 [2021-03-26]. ISSN 0365-110X. doi:10.1107/S0365110X50000021. （原始内容存档于2018-06-03）.

[3] Rakhimov, K.; Zhigarnovskii, B. M.; Polyakov, Yu. A.; Bugakov, V. I.; Orlovskii, V. P.; Kozhenkov, V. Yu.; Abdullaeva, M. I. Synthesis and investigation of the physicochemical properties of hydrothioarsenates of potassium, rubidium, and cesium（俄文）. Izvestiya Akademii Nauk SSSR, Neorganicheskie Materialy, 1987. 23 (10): 1691-1695. ISSN: 0002-337X.

[4] K. Holz, R. Mattes. Verbindungen des Antimon(III) mit SbFnOm-Koordinationsspähre Kristallstrukturen von K(SbF₂)HAsO₄, NH₄(SbF₂)HAsO₄ und Sb₃O₂F₅. Zeitschrift für anorganische und allgemeine Chemie. 1989, 578 (1): 133–142 [2021-03-26]. ISSN 0044-2313. doi:10.1002/zaac.19895780115 （德语）.

[5] Lothar Kolditz. Herbert W. Roesky , 编. Fluoro and Fluorohydroxy Complexes of As, Sb, and Sn. Hoboken, NJ, USA: John Wiley & Sons, Inc. 2012-10-14: 117–120 [2021-03-26]. ISBN 9781118409466. doi:10.1002/9781118409466.ch20 （英语）.

[6] Zuldjevat Abdija, Metodija Najdoski, Violeta Koleva, Tomče Runčevski, Robert E. Dinnebier, Bojan Šoptrajanov, Viktor Stefov. Preparation, Structural, Thermogravimetric and Spectroscopic Study of Magnesium Potassium Arsenate Hexahydrate: Preparation of Magnesium Potassium Arsenate Hexahydrate. Zeitschrift für anorganische und allgemeine Chemie. 2014-12, 640 (15): 3177–3183 [2021-03-26]. doi:10.1002/zaac.201400265 （英语）.

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