फॉस्फो टंगस्टिक एसिड

Name: फॉस्फो टंगस्टिक एसिड
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Minimum Order Quantity : 25 KilogramsBrand Name : KAROLINSKA

घुलनशीलता	water soluble
विषैला	ना
मेल्टिंग पॉइंट	89 °C
ग्रेड	Extra Pure,
स्ट्रक्चरल फॉर्मूला	H3PW12O40

विस्‍तृत जानकारी

घुलनशीलता	water soluble
विषैला	ना
मेल्टिंग पॉइंट	89 °C
ग्रेड	Extra Pure,
स्ट्रक्चरल फॉर्मूला	H3PW12O40
उपयोग	Catalyst In common with the other heteropolyacids phosphotungstic acid is a catalyst and its high acidity and thermal stability make it a catalyst of choice according to some researchers.[13] It is in solution as a homogeneous catalyst, and as a heterogeneous catalyst "supported" on a substrate e.g. alumina, silica. Some acid catalysed reactions include: the homogeneous catalysis of the hydrolysis of propene to give 2-propanol the homogeneous catalysis of the Prins reaction the heterogeneous catalysis of the dehydration of 2-propanol to propene and methanol to hydrocarbons. Dyeing and pigments Phosphotungstic acid has been used to precipitate different types of dyes as "lakes".[14] Examples are basic dyes and triphenylmethane dyes, e.g. pararosaniline derivatives. Histology Phosphotungstic acid is used in histology for staining specimens, as a component of phosphotungstic acid haematoxylin, PTAH, and “trichrome” reagents, and as a negative stain for imaging by a transmission electron microscope. Phosphotungstic acid haematoxylin (PTAH) Mallory described the reagent now generally known as PTAH in 1897.[16] PTAH stains tissues either reddish brown or blue depending on their type. This property of simultaneously staining two different colours is different from other haematoxylin reagents e.g. alum-haematoxylin. The role of phosphotungstic acid and the mechanism of staining is not fully understood. Interestingly the active component of haematoxylin is the oxidised form, haematin, although this rarely acknowledged in the literature which refer to haematoxylin staining. Phosphotungstic acid forms a lake with haematin.[17] The make –up of the reagent is uncertain, examination of a year old sample showed there to be three coloured components, blue, red and yellow.[18] These were not identified. Some investigations of “model” systems, reacting various compounds such as amino acids, purines, pyrimidines and amines with PTAH show that they give rise to different colours. Trichrome reagents In these reagents two or three basic dyes are used with phosphotungstic acid, in either a one step or multi-stage procedure. These reagents colour different tissue types different colours. Again the mechanism of staining is not fully understood. Some explanations include the proposal that phosphotungstic acid acts as a mordant to bind the dye to the tissue[20] or that alternatively it binds to tissue blocking it to dye molecules. Negative staining Adsorption onto tissue or the surface of viruses and its electron density are the bases of phosphotungstic acids action as a negative stain. This electron density arises from the presence of the 12 tungsten atoms which each have an atomic number of 74. The mechanism of the adsorption onto tissue has been proposed as being electrostatic rather than involving hydrogen bonding, as adsorption is not affected by pH. Analysis The potassium salt is only slightly soluble, unlike most other phosphotungstate salts, and has been proposed as a method for the gravimetric analysis of potassium. Precipitation of proteins In a number of analytical procedures one of the roles of phosphotungstic acid is to precipitate out proteins. It has been termed a "universal" precipitant for polar proteins.[23] Further studies showed that no precipitation occurred with α-amino groups but did occur with guanidino, ε-amino and imidazole groups. Medicinal Very little work appears to have been carried out in this area. One example relates to liver necrosis in rats. Composite proton exchange membranes The heteropoly acids, including phosphotungstic acid, are being investigated as materials in composite proton exchange membranes, such as Nafion. The interest lies in the potential of these composite materials in the manufacture of fuel cells as they have improved operating characteristics
स्टोरेज	कमरे का तापमान
पवित्रता	99%min
प्रॉपर्टीज़	Phosphotungstic acid can be prepared by the reaction of sodium tungstate, Na2WO4.2H2O, with phosphoric acid, H3PO4, acidified with hydrochloric acid, HCl.[2] Phosphotungstic acid solutions decompose as the pH is increased. A step-wise decomposition has been determined and the approximate compositions at various pH values are as follows:[8] pH principal components 1.0 [PW12O40]3− 2.2 [PW12O40]3−, [P2W21O71]6−, [PW11O39]7− 3.5 [PW12O40]3−, [P2W21O71]6−, [PW11O39]7−, [P2W18O62]6−, [P2W19O67]10− 5.4 [P2W21O71]6−, [PW11O39]7−, [P2W18O62]6− 7.3 [PW9O34]9− 8.3 PO43−, WO42− The species [PW11O39]7− is a lacunary, or defective Keggin ion. The [P2W18O62]6− has a Dawson structure. At pH less than 8, the presence of ethanol or acetone stabilises the anion, [PW12O40]3−, reducing decomposition.[8] Tungstophosphoric acid is thermally stable up to 400 °C, and is more stable than the analogous silicotungstic acid, H4SiW12O40.[9] Large quantities of polar molecules such as pyridine are absorbed into the bulk phase and not simply on the surface. Solid state NMR studies of ethanol absorbed in the bulk phase show that both protonated dimers, ((C2H5OH)2H+) and monomers, (C2H5OH2+) are present. Phosphotungstic acid is less sensitive to reduction than phosphomolybdic acid. Reduction with uric acid or iron(II) sulfate produces a brown coloured compound. the related silicotungstic acid when reduced forms a similar brown compound where one of the four W3 units in the Keggin structure becomes a metal-metal bonded cluster of three edge shared W(IV) octahedra.[10] Phosphotungstic acid is the strongest of heteropolyacids. Its conjugate base is the PW12O403− anion.[11] Its acidity in acetic acid has been investigated and shows that the three protons dissociate independently rather than sequentially, and the acid sites are of the same strength.[12] One estimate of the acidity is that the solid has an acidity stronger than H0 =−13.16,[9] which would qualify the compound as a superacid. This acidic strength means that even at low pH the acid is fully dissociated.
एप्लीकेशन	लैब केमिकल्स
कैस नं	1343-93-7
आण्विक सूत्र	H3PW12O40
प्रॉडक्ट टाइप	Powder
स्वाद	गंधहीन
भौतिक रूप	पाउडर
शेप	स्फटिक
शेल्फ लाइफ	5वर्ष
एच एस कोड	2811
आणविक भार	2,880.2 g/mol किलोग्राम (kg)
पवित्रता	98%
कैस नं	12501-34-4
दुसरे नाम	Phospho Tungstic Acid

नमूना नीति	एक निश्चित मूल्य सीमा के भीतर, मुफ्त नमूने उपलब्ध हैं
डिलीवरी का समय	1हफ़्ता
पैकेजिंग का विवरण	with 25 kg drum packing
मुख्य निर्यात बाजार	ऑस्ट्रेलिया, पूर्वी यूरोप, पश्चिमी यूरोप, मध्य अमेरिका, मिडल ईस्ट, दक्षिण अमेरिका, एशिया, उत्तरी अमेरिका, अफ्रीका
मुख्य घरेलू बाज़ार	ऑल इंडिया
नमूना उपलब्ध	1
एफओबी पोर्ट	Mumbai
भुगतान की शर्तें	चेक, कैश इन एडवांस (CID), कैश ऑन डिलीवरी (COD), कैश अगेंस्ट डिलीवरी (CAD), कैश एडवांस (CA)
आपूर्ति की क्षमता	1000प्रति दिन

कंपनी का विवरण

एवंस चेम इंडिया पवत. ल्टड., 2003 में महाराष्ट्र के मुंबई में स्थापित, भारत में अम्ल का टॉप निर्माता,निर्यातक,आपूर्तिकर्ता,उत्पादक है। एवंस चेम इंडिया पवत. ल्टड. ट्रेड इंडिया के सूचीबद्ध उत्पादों के सत्यापित और विश्वसनीय विक्रेताओं में से एक है। आपूर्ति और व्यापार के अपने व्यापक अनुभव के साथ, एवंस चेम इंडिया पवत. ल्टड. ने उच्च गुणवत्ता आदि के साथ बाजार में अपने लिए एक प्रतिष्ठित नाम बनाया है।
ग्राहक केंद्रित दृष्टिकोण पर ध्यान केंद्रित करते हुए, एवंस चेम इंडिया पवत. ल्टड. की अखिल भारतीय उपस्थिति है और पूरे देश में एक विशाल उपभोक्ता आधार को पूरा करता है। एवंस चेम इंडिया पवत. ल्टड. से ट्रेड इंडिया के गुणवत्ता-सुनिश्चित उत्पादों () को थोक में खरीदें।

व्यापार के प्रकार

निर्माता, निर्यातक, आपूर्तिकर्ता, उत्पादक

कर्मचारी संख्या

स्थापना

2003

कार्य दिवस

सोमवार से शनिवार

जीएसटी सं

27AABCE3201D1ZE

भुगतान का प्रकार

कैश अगेंस्ट डिलीवरी (सीएडी)