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Arsenic acid
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<p>Arsenic acid or arsoric acid is the <a href="/facts/Chemical_compound/37FXqqtv">chemical compound</a> with the <a href="/facts/Chemical_formula/hghUtthl">formula</a> H3AsO4. More descriptively written as AsO(OH)3, this colorless <a href="/facts/Acid/FySU18n1">acid</a> is the <a href="/facts/Arsenic/k1c4f44D">arsenic</a> analogue of <a href="/facts/Phosphoric_acid/l6NbwyCv">phosphoric acid</a>. <a href="/facts/Arsenate/IWco5TAH">Arsenate</a> and <a href="/facts/Phosphate/FDGVCxUG">phosphate</a> salts behave very similarly. Arsenic acid as such has not been isolated, but is only found in solution, where it is largely ionized. Its <a href="/facts/Hemihydrate/ot9HMgSk">hemihydrate</a> form (2H3AsO4·H2O) does form stable crystals. Crystalline samples dehydrate with condensation at 100 °C. </p>