Titration permanganate

It is possible to monitor the reaction and determine the end point by the absence of an a,/S-unsaturated ketone absorption in the UV or by the determination of the consumption of ca. one molar equivalent of hydrogen peroxide by permanganate titration. 

Footnotes to Table 3 a—by K permanganate titration b—gravimetrically by loss in wt after heating c— gravimetrically by exposure of a sample to 75% RH... 

Thereafter, analysis was done by faster techniques based on oxalate-permanganate titrations which involved a precipitation procedure followed by quick titration of pre-heated solutions containing oxalate ions. 

Representative permanganate titrations are listed in Table 16-3. For titrations in strongly acidic solution, KMn04 serves as its own indicator because the product, Mn2+, is colorless (Color Plate 8). The end point is taken as the first persistent appearance of pale pink MnOj. If the titrant is too dilute to be seen, an indicator such as ferroin can be used. 

In the analytical determination of the hyponitrites, W. Zorn treated soln. of the free acid, or of its salts in cold dil. nitric acid with an excess of silver nitrate, and just neutralized the free acid with ammonia or sodium carbonate. The washed and dried precipitate was weighed as silver hyponitrite, or weighed as metal or chloride. A. Thum treated the aq. soln. of the acid with an excess of a soln. of permanganate, and in 15 minutes added sulphuric acid after standing for another hour the soln. was warmed to 30°, and treated with a known quantity of 0-1A-oxalie acid sufficient to decolorize the permanganate. The excess oxalic acid was determined by permanganate titration. A. Hantzsch and A. Sauer, and... 

Characterization of the activated carbon by adsorption nearly saturated water with benzene and activated carbon were introduced into a batch reactor with a 0.06 and 0.14 ratio of solid/liquid phases. In each experiment, the evolution ofthe concentration of benzene in water was determined spectrophotometrically and by potassium permanganate titration. Tables 3.22 and 3.23 as well as Figs. 3.82-3.84 show... 

I>o you think that cadmitim could replace zinc for reducing ferric ion to the ferrous state preliminary to permanganate titration Coidd metallic iron itself be used as the reducing agent f( r this purpose ... 

Newbrun (N2) reported the determination of calcium in saliva by atomic absorption. When samples were diluted with water only, results were obviously too low, but with strontium, lanthanum, or EDTA the values agreed with those obtained by oxalate permanganate titration. Calcium was higher in the excretion from the submaxillary glands than in that from the parotid. Depletion of saliva calcium content was not seen after 15-minute. stimulation. 

Shomate and Kelley (8, 52.6-296.3 K) measured the low temperature heat capacities for VN. The purity of the mononitride sample based on an analysis for vanadium by permanganate titration was found to be 99.76 weight percent. Their C data corrected... 

Does the end point in a permanganate titration coincide with the equivalence point Explain and suggest how any discrepancies might be corrected. 

The product is a fine gray-green powder which has the crystallographic properties reported for the trifluoride. Anal. Calcd. for VF3 V, 47.0 F, 53.0. Found V, 47.0 F, 52.1. Fluorine is determined by a pyrohydrolytic procedure.Vanadium is determined by permanganate titration of a sample dissolved in sulfuric acid. Contamination of the product by nickel from the container is less than 0.05%, the limit of detection by spectroscopy. 

Besides ferric ammonium sulfate, permanganate solutions can be used to titrate the reduced titanium. Although many cations interfere with the permanganate titration, this reagent is still useful in the assay of highly purified titanium dioxide materials. Potassium dichromate can be used to titrate Ti(III) solutions (with the aid of 0.2% indigo as the indicator), and Ce(lV) reagents can also be used as titrants. 

The j8-form, unlike the a-form, is only sUghtly soluble in sulfuric acid solution. The mixture containing the dense white europium(II) sulfate is cooled and filtered. The precipitate is washed with dilute hydrochloric acid and then with a few nuUiliters of methyl alcohol containing hydrogen chloride. An atmosphere of carbon dioxide is not required during the filtration. The final product is dried in air at 75°. Yield 4.4 g. (90 per cent). Anal. 99.7 per cent purity (acid iron(III) sulfate-permanganate titration). 

Box 6-1 stated that nitrogen compounds derived from animals and plants are broken down to ammonia hetm>trophic bacteria. Ammonia is oxidized first to nitrite 02 ) and then to nitrate (NO J) by nitrifying bacteria. In Section 6-3 we saw how a permanganate titration was used to standardize a nitrite stock solution. The nitrite solution is used here to pr xue standards for a spectrophotometric analysis of nitrite in aquarium water. 

Metallic peroxides are of little importance in pharmaceutical practice other than as ingredients of dentifrices. Their peroxide content may be determined either by permanganate titration in acid solution or by the iodide method given above. 

Calcium aminosalicylate, Ci4Hi206N2Ca,JH20, Mol. Wt. 353 4, or Ci4Hi206N2Ca, 3H2O, Mol. Wt. 398 4, may be determined by the method given for the sodium salt. Calcium can be assayed either by permanganate titration after precipitation as oxalate, or by EDTA. 

This compound is easily prepared by oxidation of cobalt(II) carbonate, with lead dioxide in presence of oxalic acid and potassium oxalate. It can be analysed for oxalate by permanganate titration and for cobalt by titrating iodine liberated on adding K1 to the acidified solution, after precipitating cobalt(III) oxide. 

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