Determination permanganate number

You are given the skeleton equation for the reaction of permanganate and sulfur dioxide. You also know that the reaction takes place in an acid solution. With this information, the rules for determining oxidation numbers, and the steps for balancing by half-reactions, you can write a complete balanced equation. 

By far the most commonly used oxidation method is the corrected permanganate number test (30) in which the number of mL of 0.1 AT KMn04 consumed by 1 g of oven-dried pulp under specified conditions (kappa number) is determined (TAPPI Historical Method T236 hm-85). Typical kappa numbers for representative pulps are shown in Table 3. 

Chakactkrisation of Unsaturatkd Aliphatic Hydrocarbons Unlike the saturated hydrocarbons, unsaturated aliphatic hydrocarbons are soluble in concentrated sulphuric acid and exhibit characteristic reactions with dUute potassium permanganate solution and with bromine. Nevertheless, no satisfactory derivatives have yet been developed for these hydrocarbons, and their characterisation must therefore be based upon a determination of their physical properties (boiling point, density and refractive index). The physical properties of a number of selected unsaturated hydrocarbons are collected in Table 111,11. 

Braun [22] showed from ozonolysis that for fractions of bulk PVC the number of internal double bonds and the rate of thermal degradation, although dependent on each other, were independent of the molecular weight. This clearly demonstrated the role of internal unsaturation on the stability of the polymer. After careful chlorination of the double bonds, an increase in thermal stability was observed and the number of double bonds as determined by oxidation with potassium permanganate were reduced. It was also shown that one polyene sequence was formed from each isolated double bond. 

The equivalent of an oxidising agent is determined by the change in oxidation number which the reduced element experiences. It is the quantity of oxidant which involves a change of one unit in the oxidation number. Thus in the normal reduction of potassium permanganate in the presence of dilute sulphuric acid to an Mn(II) salt ... 

First, the number of moles of potassium permanganate in the diluted solution must be determined ... 

Another way of determining the transference numbers is moving boundary methode, whereby the movement of a visible boundary between two solutions of different electrolytes in an electrical field is followed by observing the colour or light refraction. If for instance a solution of potassium permanganate is in contact with a solution of potassium nitrate the displacement of colored... 

Srinivasa Rao Y, Shukla RN, Maheshwari S, Kulkarni AY, Jivendra Y (1983) Determination of permanganate and kappa number of pulp with high ash content. IPPTA 20(3) 55-56 Stewart CM, Foster OH, Cohen WE, Leslie RT, Watson AJ (1951) The selection and preparation of a reporducible wood sample for chemical studies. Appita 5 267- 311 Swan B (1965) Isolation of acid-soluble lignin from the Klason lignin determination. Sven Papperstidn 68 791-795... 

Other important anions that don t fit into the prior two categories are called special anions in this book. They are listed in Table 6.4. Names for anions that contain oxygen but are not included in Table 6.3 may sometimes be determined because of a periodic relationship between their central element and that of an ion in that table. For example, Mn04 is analogous to CIO4 because both central elements are in periodic groups numbered Vll. Its name is permanganate. 

However, as the formaldehyde formed by the hydrolysis of monochloromethyl chloroformate is also oxidised by potassium permanganate it must be first determined by titration with iodine solution. Then, by subtracting from the number of ml. permanganate solution decolorised, twice the number of ml. of iodine solution used (for formaldehyde needs twice as much oxygen as formic acid for its oxidation), the result is the number of ml. permanganate corresponding to the quantity of formic acid present and from this the chloromethyl formate in the sample may be calculated. 

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