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|Section2= |Section3= }} Potassium arsenite (KAsO2) is an inorganic compound that exists in two forms, potassium meta-arsenite (KAsO2) and potassium ortho-arsenite (K3AsO3). It is composed of arsenite ions (AsO33− or AsO2−) with arsenic always existing in the +3 oxidation state, and potassium existing in the +1 oxidation state. Like many other arsenic containing compounds, potassium arsenite is highly toxic and carcinogenic to humans. Potassium arsenite forms the basis of Fowler’s solution, which was historically used as a medicinal tonic, but due to its toxic nature its use was discontinued. Potassium arsenite is still, however, used as a rodenticide.〔Potassium Arsenite. http://nj.gov/health/eoh/rtkweb/documents/fs/1557.pdf〕 ==Structure== The two unique forms of potassium arsenite can be attributed to the different number of oxygen atoms. Potassium meta-arsenite (KAsO2) contains two oxygen atoms one of which is bonded to the arsenic atom via a double bond. Conversely, Potassium ortho-arsenite (K3AsO3) consists of three oxygen atoms all bound to the arsenic atom via single bonds. In each of these cases, arsenic exists in the +3 oxidation state and is known as arsenite, hence the single name referring to two different structures.〔 Additionally, both the meta and ortho forms of potassium arsenite have identical properties. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Potassium arsenite」の詳細全文を読む スポンサード リンク
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