Sodium arsenate

Updated on Dec 11, 2024

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Formula Na3AsO4 Density 2.87 g/cm³ Classification Arsenates		Molar mass 207.8885 g/mol Melting point 280 °C Appearance colourless solid

Sodium arsenate is the inorganic compound with the formula Na₃AsO₄. Related salts are also called sodium arsenate, including Na₂HAsO₄ (disodium hydrogen arsenate) and NaH₂AsO₄ (sodium dihydrogen arsenate). The trisodium salt is a white or colourless solid that is highly toxic. It is usually handled as the dodecahydrate Na₃AsO₄^.12H₂O.

The compound can be obtained by neutralizing arsenic acid:

H₃AsO₄ + 3 NaOH → Na₃AsO₄

The salt (as its dodecahydrate) is isomorphous with trisodium phosphate.

References

Sodium arsenate Wikipedia

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