What is Arsenous acid?
'''Arsenous acid''', also known as '''arsenious acid''', is a [[chemical compound]]. It is also an [[acid]]. Its chemical formula is As(OH)<sub>3</sub>. It has [[arsenic]] and [[hydroxide]] [[ion]]s in it. The arsenic is in its +3 [[oxidation state]]. ==Properties== Arsenous acid is a colorless [[solution]]. It is a [[weak acid]]. It reacts with [[base (chemistry)|bases]] to make [[arsenite]] [[salt]]s. It is highly [[toxic]]. It cannot be made in a [[crystalline]] form because it turns into [[arsenic trioxide]] and water again. It is similar to [[phosphorous acid]], although it is not a strong [[reducing agent]]. ==Preparation== It is made by dissolving [[arsenic trioxide]] or [[arsenic trichloride]] in water. ==Related pages== *[[Arsenic acid]] *[[Arsenic tribromide]] *[[Arsenic trisulfide]] *[[Nitrous acid]] [[Category:Acids]] [[Category:Arsenic compounds]]