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H 2 AsO − 4 + H 2 O ⇌ HAsO 2− 4 + [H 3 O] +, pK a2 = 6.94 HAsO 2− 4 + H 2 O ⇌ AsO 3− 4 + [H 3 O] +, pK a3 = 11.5. These pK a values are close to those for phosphoric acid. The highly basic arsenate ion (AsO 3− 4) is the product of the third ionization. Unlike phosphoric acid, arsenic acid is an oxidizer, as illustrated by its ...
In its standard state arsine is a colorless, denser-than-air gas that is slightly soluble in water (2% at 20 °C) [1] and in many organic solvents as well. [citation needed] Arsine itself is odorless, [5] but it oxidizes in air and this creates a slight garlic or fish-like scent when the compound is present above 0.5 ppm. [6]
Trihydrogen arsenate is also known as arsenic acid. At a given pH, the distribution of these arsenate species can be determined from their respective acid dissociation constants. [17] H 3 AsO 4 + H 2 O ⇌ H 2 AsO − 4 + [H 3 O] + (pK a1 = 2.19) H 2 AsO − 4 + H 2 O ⇌ HAsO 2− 4 + [H 3 O] + (pK a2 = 6.94) HAsO 2− 4 + H 2 O ⇌ AsO 3− 4 ...
Substance Formula 0 °C 10 °C 20 °C 30 °C 40 °C 50 °C 60 °C 70 °C 80 °C 90 °C 100 °C Barium acetate: Ba(C 2 H 3 O 2) 2: 58.8: 62: 72: 75: 78.5: 77: 75
The biogeochemistry of arsenic is complex and includes various adsorption and desorption processes. The toxicity of arsenic is connected to its solubility and is affected by pH. Arsenite (AsO 3− 3) is more soluble than arsenate (AsO 3− 4) and is more toxic; however, at a lower pH, arsenate becomes more mobile and toxic. It was found that ...
In gastroenterology, esophageal pH monitoring is the current gold standard for diagnosis of gastroesophageal reflux disease (GERD). It provides direct physiologic measurement of acid in the esophagus and is the most objective method to document reflux disease, assess the severity of the disease and monitor the response of the disease to medical or surgical treatment.
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.
Arsenic (III) enters the cells though aquaporins 7 and 9, which is a type of aquaglyceroporin. [26] Arsenic (V) compounds use phosphate transporters to enter cells. [26] The arsenic (V) can be converted to arsenic (III) by the enzyme purine nucleoside phosphorylase. [26]