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Dihydroxyphosphine Oxide Phosphorous Acid H3PO3 Colorless Phosphates Production

Dihydroxyphosphine Oxide Phosphorous Acid H3PO3 Colorless Phosphates Production

    • Dihydroxyphosphine Oxide Phosphorous Acid H3PO3 Colorless Phosphates Production
    • Dihydroxyphosphine Oxide Phosphorous Acid H3PO3 Colorless Phosphates Production
  • Dihydroxyphosphine Oxide Phosphorous Acid H3PO3 Colorless Phosphates Production

    Product Details:

    Place of Origin: Hunan
    Brand Name: Kemsky/SGS
    Certification: ISO 9001
    Model Number: Dihydroxyphosphine oxide Phosphorus trihydroxide

    Payment & Shipping Terms:

    Minimum Order Quantity: 1 metric ton
    Price: usd 1250 per ton
    Packaging Details: 25 kgs bag,1000 kgs big bag
    Delivery Time: 5-8 days
    Payment Terms: T/T , L/C
    Supply Ability: 3000 tons per month
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    Detailed Product Description
    Name: Dihydroxyphosphine Oxide Phosphorous Acid Other Name: Dihydroxyphosphine Oxide Orthophosphorous Acid
    Color: Colorless Situation: Crystalline Solid Granule
    Shelf Life: 2 Years Packing: 25 Kgs Plastic Woven Bag Or As Required

    Phosphorous acid H3PO3 CAS No: 13598-36-2

    Phosphorous acid H3PO3

    Phosphorous acid CAS No: 13598-36-2

    Product Description

    Product Parameters

    Apperance White Crystal Main content 99%min
    Chloride 0.01%max Iron 0.008%max
    Phosphate 0.01%max Sulfate 0.006%max
    Heavy metal 0.001%max Water-solubility Excellent

    Phosphorous acid

    Phosphorous acid is a colorless crystal. It can be slowly oxidized to phosphoric acid in the air. When heated to 180 °C, it can be decomposed into phosphoric acid and phosphine (highly toxic). As a dibasic acid, it has slightly ber acidity than phosphoric acid. Phosphorous acid has b reducibility and can easily reduce Ag+ to metal silver. It can also reduce sulfuric acid to sulfur dioxide. It is corrosive and has b hygroscopicity.


    Reductions of metal ions

    Both phosphorous acid and its deprotonated forms are good reducing agents, although not necessarily quick to react. They are oxidized tophosphoric acid or its salts. It reduces solutions of noble metal cations to the metals. When phosphorous acid is treated with a cold solution ofmercuric chloride, a white precipitate of mercurous chloride forms:
    H3PO3 + 2 HgCl2 + H2O → Hg2Cl2 + H3PO4 + 2 HCl
    Mercurous chloride is reduced further by phosphorous acid to mercury on heating or on standing:
    H3PO3 + Hg2Cl2 + H2O → 2 Hg + H3PO4 + 2 HCl

    Acid–base properties

    Phosphorous acid is a strong acid with a pKa in the range 1.26–1.3.[4][5]
    HP(O)(OH)2 → HP(O)2(OH)− + H+ pKa = 1.3
    It is a diprotic acid, the hydrogenphosphite ion, HP(O)2(OH)− is a moderately strong acid:
    HP(O)2(OH)− → HPO32− + H+ pKa = 6.7
    The conjugate base HP(O)2(OH)− is called hydrogen phosphite, and the second conjugate base, HPO2−
    3, is the phosphite ion.[6] (Note that the IUPAC recommendations are hydrogen phosphonate and phosphonate respectively).
    The hydrogen bonded directly to the phosphorus atom is not readily ionizable. Chemistry examinations often test students' appreciation of the fact that not all three hydrogen atoms are acidic under aqueous conditions, in contrast with H3PO4.
    Technical data

    Items Testing Result
    Appearance White Powder
    Purity (%) 99.0 %min
    Chloride (%) 0.01%max
    SO42(%) 0.01%max
    PO42(%) 0.2%max
    Iron (as Fe, ppm) 0.001%max


    The most important use of phosphorous acid (phosphonic acid) is the production of basic lead phosphite, which is a stabilizer in PVC and related chlorinated polymers.[3]
    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.[10] 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.
    Organic derivatives

    The IUPAC (mostly organic) name is phosphonic acid. This nomenclature is commonly reserved for substituted derivatives, that is, organic group bonded to phosphorus, not simply an ester. For example, (CH3)PO(OH)2 is "methylphosphonic acid", which may of course form "methylphosphonate" esters.
    Phosphorous acid H3PO3 CAS No: 13598-36-2

    Product properties


    Appearance: white crystal

    Density: 1.65

    Melting point:73

    Boiling point: 200

    UN No:2834

    Haradous class: 8


    Product Name


    As a ligand

    Upon treatment with metals of d6 configuration, phosphorous acid is known to coordinate as the otherwise rare P(OH)3 tautomer. Examples include Mo(CO)5(P(OH)3) and [Ru(NH3)4(H2O)(P(OH)3)]2+.[8][9]




    On heating at 200 °C, phosphorous acid disproportionates to phosphoric acid and phosphine:[7]
    4 H3PO3 → 3 H3PO4 + PH3
    This reaction is used for laboratory-scale preparations of PH3.

    HPO(OH)2 is the product of the hydrolysis of its acid anhydride:
    P4O6 + 6 H2O → 4 HPO(OH)2
    (An analogous relationship connects H3PO4 and P4O10).
    On an industrial scale, the acid is prepared by hydrolysis of phosphorus trichloride with water or steam:[3]
    PCl3 + 3 H2O → HPO(OH)2 + 3 HCl
    Potassium phosphite is also a convenient precursor to phosphorous acid:
    K2HPO3 + 2 HCl → 2 KCl + H3PO3
    In practice aqueous potassium phosphite is treated with excess hydrochloric acid. By concentrating the solution and precipitations with alcohols, the pure acid can be separated from the salt.
    Nomenclature and tautomerism

    H3PO3 is more clearly described with the structural formula HPO(OH)2. In the solid state, HP(O)(OH)2 is tetrahedral with one shorter P=O bond of 148 pm and two longer P–O(H) bonds of 154 pm. This species exists in equilibrium with an extremely minor tautomer P(OH)3. IUPAC recommends that the latter be called phosphorous acid, whereas the dihydroxy form is called phosphonic acid.[2] Only the reduced phosphorus compounds are spelled with an "ous" ending.
    Other important oxyacids of phosphorus are phosphoric acid (H3PO4) and hypophosphorous acid (H3PO2). The reduced phosphorus acids are subject to similar tautomerism involving shifts of H between O and P.
    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.Product Applications

    Usage: Widely used in the production of phosphite materials, as the raw material in the production of plastic stabilizer in plastic industry, as reducing agent in chemical reaction, it can be used in the synthesis of fiber and pesticide industry, etc







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