Potassium arsenate

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Potassium arsenate
IUPAC name Potassium dihydrogen arsenate
Other names Potassium arsenate
Identifiers
CAS number [7784-41-0]
PubChem 24891115
Properties
Molecular formula KH2AsO4
Molar mass 180.03
Appearance colourless solid
Melting point

277-283 °C

Hazards
Main hazards toxic
Except where noted otherwise, data are given for
materials in their standard state
(at 25 °C, 100 kPa)

Infobox disclaimer and references

Potassium arsenate is the chemical compound with the formula KH2AsO4. Other salts are also called potassium arsenate, including K2HAsO4 and K3AsO4. Each of these species is derived from arsenic acid:

H3AsO4 + KOH → KH2AsO4 + H2O
KH2AsO4 + KOH → K2HAsO4 + H2O
K2HAsO4 + KOH → K3AsO4 + H2O

These species are closely related to the corresponding potassium phosphates. The anions H2AsO4, HAsO42−, and AsO43− feature tetrahedral AsO4 with two, one, or no H atoms attached to the oxygen atom(s), respectively.

Although this and related arsenic salts have been prescribed for health purposes, such compounds are highly toxic.


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