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CAS Number 13598-36-2
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Empirical Formula (Hill Notation) H3O3P
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Molecular Weight 82.00
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EC Number 237-066-7
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MDL number MFCD00137258
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PubChem Substance ID 329752161
Phosphorous acid is the compound described by the formula H3PO3. This acid is diprotic (readily ionizes two protons), not triprotic as might be suggested by this formula.
Phosphorous acid is an intermediate in the preparation of other phosphorus
compounds.
Detailed Description:
Uses
The most important use of phosphorous acid
(phosphonic acid) is the production of phosphites (phosphonates) which are used
in water treatment. Phosphorous acid is also used for preparing phosphite
salts, such as potassium phosphite. These salts, as well as aqueous solutions of pure phosphorous
acid, are fungicides. Phosphites have
shown effectiveness in controlling a variety of plant diseases, in particular,
treatment using either trunk injection or foliar containing phosphorous acid
salts is indicated in response to infections by phytophthora and pythium-type plant pathogens (both within
class oomycetes, known as water molds), such as dieback/root rot and downy mildew.[9] Anti-microbial
products containing salts of phosphorous acid are marketed in Australia as
'Yates Anti-Rot'; and in the United States of
America, for example, aluminum salts of the monoethyl ester
of phosphorous acid (known generically as 'Fosetyl-Al') are sold under the
trade name 'Aliette'. Phosphorous acid and its salts, unlike phosphoric acid,
are somewhat toxic and should be handled carefully.
PRICES
$308.1/KG OR $140.04/IB
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