|Molar mass||129.911 g/mol|
|Appearance||white or grayish powder
|Density||1.87 g/cm 3|
|Melting point||550 °C (1,022 °F; 823 K) decomposes|
|156 g/100 mL|
|Solubility||slightly soluble in alcohol|
LD50 (Median lethal dose)
|41 mg/kg (rat, oral)|
Except where noted otherwise, data is given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
|what is: / ?)(|
Sodium arsenite usually refers to the inorganic compound with the formula NaAsO2. Also called sodium meta-arsenite, it is the sodium salt of arsenous acid. Sodium arsenite also ) Na3AsO3, called sodium ortho-arsenite. The compounds are colourless solids.
Synthesis and structure
A mixture of sodium meta-arsenite and sodium ortho-arsenite is produced by treating arsenic trioxide with sodium carbonate or sodium hydroxide. Sodium arsenite is amorphous, typically being obtained as a powder or as a glassy mass. The compound consists of the polymer [AsO2]n−
n associated with sodium cations, Na+. The polymer backbone has the connectivity -O-As(O−)-.
Sodium arsenite can be inhaled or absorbed through the skin. Along with its known carcinogenic and teratogenic effects, contact with the substance can yield symptoms such as skin irritation, burns, itching, thickened skin, rash, loss of pigment, poor appetite, a metallic or garlic taste, stomach pain, nausea, vomiting, diarrhea, convulsions, decreased blood pressure, and headache. Severe acute poisoning may lead to nervous system damage resulting in weakness, poor coordination, or “pins and needles” sensations, eventual paralysis, and death.
The LD50 (oral, mouse) is 40 mg/kg.
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