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Arsenic acid or arsoric acid is the chemical compound with the formula H 3 AsO 4. More descriptively written as AsO(OH) 3, this colorless acid is the arsenic analogue of phosphoric acid. Arsenate and phosphate salts behave very similarly. Arsenic acid as such has not been isolated, but is only found in solution, where it is largely ionized.
Arsenic forms colorless, odorless, crystalline oxides As 2 O 3 ("white arsenic") and As 2 O 5 which are hygroscopic and readily soluble in water to form acidic solutions. Arsenic(V) acid is a weak acid and its salts, known as arsenates, [36] are a major source of arsenic contamination of groundwater in regions with high levels of naturally ...
Arsenic forms colorless, odorless, crystalline oxides As 2 O 3 ("white arsenic") and As 2 O 5 which are hygroscopic and readily soluble in water to form acidic solutions. Arsenic(V) acid is a weak acid and the salts are called arsenates , [ 5 ] the most common arsenic contamination of groundwater , and a problem that affects many people.
Like all arsenic-containing compounds, arsonic acids are toxic and carcinogenic to humans. [1] [2] Arsonic acid refers to H 3 As O 3, the case where the substituent is a single hydrogen atom. The other arsonic acids can simply be viewed as hydrocarbyl derivatives of this base case. Arsenic acid results when the substituent is a hydroxyl group.
The compound can be obtained by neutralizing arsenic acid: H 3 AsO 4 + 3 NaOH → Na 3 AsO 4 + 3 H 2 O. The salt (as its dodecahydrate) is isomorphous with trisodium phosphate. [3] The anion AsO 4 3-exists at high pH, but below pH 11.5, it converts to HAsO 4 2-(also written HOAsO 3 2-).
With its first pK a being 9.2, As(OH) 3 is a weak acid. [4] Reactions attributed to aqueous arsenic trioxide are due to arsenous acid and its conjugate bases. Like arsenic trioxide, arsenous acid is sometimes amphoteric. For example, it reacts with hydrochloric, hydrobromic, and hydroiodic acids to produce arsenic trichloride, tribromide, and ...
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The old (but extremely sensitive) Marsh test generates AsH 3 in the presence of arsenic. [4] This procedure, published in 1836 by James Marsh, [18] is based upon treating an As-containing sample of a victim's body (typically the stomach contents) with As-free zinc and dilute sulfuric acid: if the sample contains arsenic, gaseous arsine will ...