ISOPOLY AND HETEROPOLY ACIDS AND SALTS PDF

If these condensed acids contain only one type of acid anhydride, they are called isopoly acids, and their salts are called isopoly salts. The acid anhydrides also can condense with other acids e. The condensation reactions, which occur reversibly in dilute aqueous solution, involve formation of oxo bridges by elimination of water from two molecules of the weak acid. Heteropoly acids and their salts may be formed by coordination of the central atom with four to six oxo anions, which may be mononuclear containing one metal ion each , as in H 7 [P MoO 4 6 ], or trinuclear containing three metal ions each , as in H 3 [P W 3 O 10 4 ]. About 70 elements can act as central hetero atoms in heteropoly anions.

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Cite this: J. Article Views Altmetric -. Citations 3. PDF 4 MB. Abstract This procedure involves the preparation of isopoly and heteropoly salts and introduces the beginning student to liquid-liquid extraction, titration, ion exchange, conductance, and a variety of synthetic and analytical techniques. Cited By. This article is cited by 3 publications. Keggin Structure Polyoxometalates. Potentiotitrimetry of anions using quaternary ammonium halides: An overview.

Microchemical Journal , 36 1 , On the yellow colour of wulfenite PbMoO4 crystals. Kristall und Technik , 12 5 , KK Pair your accounts. Your Mendeley pairing has expired. Please reconnect. This website uses cookies to improve your user experience. By continuing to use the site, you are accepting our use of cookies. Read the ACS privacy policy.

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Heteropoly acid

A heteropoly acid is a class of acid made up of a combination of hydrogen and oxygen with particular metals and non-metals. The metal addenda atoms linked by oxygen atoms form a cluster with the hetero-atom inside bonded via oxygen atoms. Examples with more than one type of metal addenda atom in the cluster are well known. The conjugate anion of a heteropoly acid is known as a polyoxometalate. Due to the possibilities of there being different combinations of addenda atoms and different types of hetero atoms there are a lot of heteropolyacids. This type of acid is a common re-usable acid catalyst in chemical reactions. The heteropolyacids are widely used as homogeneous and heterogeneous catalysts, [2] particularly those based on the Keggin structure as they can possess qualities such as good thermal stability, high acidity and high oxidising ability.

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Isopoly and Heteropoly Acids and Salts of Mo and W: Structures of Isopoly and Heteropoly Anions

The key difference between isopoly and heteropoly acids is that isopoly acids form from the combination of similar acids or anions, whereas heteropoly acids form from the combination of different acids or anions. A poly acid is an acidic compound that forms from the combination of two acids via elimination of a water molecule. If the acids that combine are similar, then the resulting acid is an isopoly acid. But if the final product is a combination of two or more types of acids, then we call it a heteropoly acid.

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Difference Between Isopoly and Heteropoly Acids

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