新太阳集团娱乐app-欢迎莅临新太阳集团娱乐app

<xmp id="e4cec">
  • <td id="e4cec"><option id="e4cec"></option></td><td id="e4cec"></td><noscript id="e4cec"><kbd id="e4cec"></kbd></noscript>
  • <table id="e4cec"><source id="e4cec"></source></table>
  • 

    What Is Ammonium Paratungstate

    Ammonium Paratungstate Photo

    What is ammonium paratungstate? Ammonium paratungstate is white crystalline of flake or needle shape, it is short for APT.

    Chemical formula: H8N2O4W
    Molecular Weight: 283.9145
    EINECS: 234-364-9
    CAS No.: 14311-52-5

    According to different crystalline condition, its chemical formula has different forms:
    (1)3(NH4)2O?7WO3?6H2O
    (2)5(NH4),2?12WO3?5H2O
    (3)5(NH4)2O?12WO3?5H2O
    (4)5(NH4)2O?12WO3?11H2O

    Ammonium paratungstate is usually in forms of pentahydrate and decahydrate:
    1.Decahydrate: chemical formula is 5(NH4)2O?12WO3?10H2O, molecular weight is 3222.73. It is produced by evaporate tungstic acid soluble in ammonium solution, has the shape of needle and flake, insoluble in water, soluble in boiled water, lose crystal water in dry air, add in overdosed hydrochloric acid or nitric acid will separate out tungstic acid.
    2. Pentahydrate: Chemical formula is 5(NH4)2O?12WO3?5H2O.

    Ammonium paratungstate is slightly soluble in water, solubility is less than 2% under 20℃, insoluble in ethanol. Ammonium paratungstate has thermal decomposition property, when heat to 220~280℃, it will lose part of ammonium and crystal water and convert into ammonium metatungstate. When heat to over 600℃, it will lose all of ammonium and crystal water and convert into tungsten trioxide.

    If you have any interest in ammonium paratungstate, please feel free to contact us by email: sales@chinatungsten.com or by telephone:+86 592 5129696.

     

    More info>>

    1.Tungsten Trioxide

    2.Tungsten Oxide

    新太阳集团娱乐app