Sodium arsenate is the inorganic compound with the formula . Related salts are also called sodium arsenate, including Na2HAsO4 (disodium hydrogen arsenate) and (sodium dihydrogen arsenate). The trisodium salt is a white or colourless solid that is highly toxic. It is usually handled as the dodecahydrate .
The compound can be obtained by neutralizing arsenic acid:
The salt (as its dodecahydrate) is isomorphous with trisodium phosphate. The anion exists at high pH, but below pH 11.5, it converts to (also written ).
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