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Potassium arsenite (KAsO 2) is an inorganic compound that exists in two forms, potassium meta-arsenite (KAsO 2) and potassium ortho-arsenite (K 3 AsO 3). It is composed of arsenite ions (AsO 3 3− or AsO 2 − ) with arsenic always existing in the +3 oxidation state. [ 3 ]
Potassium arsenate usually refers to tripotassium arsenate K 3 AsO 4 but may also refer to: Monopotassium arsenate, KH 2 AsO 4;
The arsenate is an ion with the chemical formula AsO 3− 4. [1] Bonding in arsenate consists of a central arsenic atom, with oxidation state +5, double bonded to one oxygen atom and single bonded to a further three oxygen atoms. [2] The four oxygen atoms orient around the arsenic atom in a tetrahedral geometry. [2]
Fowler's solution first introduced in the 18th century was made up from As 2 O 3 [9] as a solution of potassium meta-arsenite, KAsO 2. [ 10 ] Arsenic in its trioxide, As 2 O 3 , (brand name Trisenox, ATO) is used as a chemotherapy drug against acute promyelocytic leukaemia (APL) , a type of myeloid leukemia. [ 11 ]
Monopotassium arsenate is the inorganic compound with the formula KH 2 AsO 4. A white solid, this salt is used to prepared other arsenic-containing compounds, mainly pesticides. It is prepared by calcining arsenic oxide and potassium nitrate, followed by extraction with water. [1]
Formula 0 °C 10 °C 15 °C 20 °C 30 °C 40 °C 50 °C 60 °C 70 °C 80 °C 90 °C 100 °C ... Potassium arsenate: K 3 AsO 4: 19: Potassium azide: KN 3: 41.4: 46.2: ...
These compounds are mainly of academic interest. For example, "sodium arsenide" is a structural motif adopted by many compounds with the A 3 B stoichiometry. Indicative of their salt-like properties, hydrolysis of alkali metal arsenides gives arsine: Na 3 As + 3 H 2 O → AsH 3 + 3 NaOH Nickel arsenide is a common impurity in ores of nickel.
Arsenate (+5 oxidation state) is the dominant form of arsenic in surface water, while arsenite (+3 oxidation state) is the dominant form in hypoxic to anoxic environments. Arsenite is more soluble and mobile than arsenate. Many species of bacteria can transform arsenite to arsenate in anoxic conditions by using arsenite as an electron donor. [189]