Sodium dihydrogen arsenate is the

inorganic compound An inorganic compound is typically a chemical compound that lacks carbon–hydrogen bonds⁠that is, a compound that is not an organic compound. The study of inorganic compounds is a subfield of chemistry known as ''inorganic chemistry''. Inorgan ...

with the

formula In science, a formula is a concise way of expressing information symbolically, as in a mathematical formula or a ''chemical formula''. The informal use of the term ''formula'' in science refers to the general construct of a relationship betwe ...

NaH₂AsO₄. Related salts are also called sodium arsenate, including Na₂HAsO₄ ( disodium hydrogen arsenate) and NaH₂AsO₄ (sodium dihydrogen arsenate). Sodium dihydrogen arsenate is a colorless solid that is highly toxic. The salt is the conjugate base of

arsenic acid Arsenic acid or arsoric acid is the chemical compound with the chemical formula, formula . More descriptively written as , this colorless acid is the arsenic analogue of phosphoric acid. Arsenate and phosphate salts behave very similarly. Arsenic ...

: :H₃AsO₄ H₂AsO + H⁺ (K₁ = 10^−2.19) In the laboratory, it is prepared in this way, crystallizing from a hot saturated aqueous solution, where it is highly soluble when hot (75.3 g in 100 mL at 100 °C). It is obtained as the monohydrate. Upon heating, solid NaH₂AsO₄H₂O, loses water of crystallization and converts to the pyroarsenate salt Na₂H₂As₂O₇.

References

Arsenates Sodium compounds {{inorganic-compound-stub