With ceric sulphate

Karrer and Schmid have noted that the dimeride of C-curarine I does not give the characteristic colour reactions of this alkaloid with acids, but still gives that with ceric sulphate and potassium dichromate (p. 384). 

C-Alkaloid UB forms a picrate, CjgH2303N2, CgHjO N, m.p. 238-240°, which gives an intense, but unstable, carrtiine colour with ceric sulphate in strong sulphuric acid and is convertible into a crystalline iodide. 

C-Alkaloid X obtained in minute quantity as a crystalline chloride, which with nitric acid gives an intense red colour with a violet fluorescence, and orange slowly becoming red, with ceric sulphate in sulphuric acid. 

Explanation A reaction usually takes place by the combination of oxidizing and reducing agents and this may be considered as the basis for the quantitative measurement of one of the reactants. For instance, FeS04 can be determined quantitatively by its reaction with ceric sulphate [Ce(S04)2] as expressed by the following equation ... 

Some of the volumetric methods described above may also be adapted to the electrometric determination of arsenic. Such methods have been described for titration of arsenites with ceric sulphate,9 iodine in the presence of sodium bicarbonate,10 chloramine (p-toluene-sulphone chloramide),11 alkaline potassium ferricyanide solution,12 potassium bromate13 or potassium iodate14 in the presence of hydrochloric acid, silver nitrate15 (by applying a secondary titration with 01N alkali to maintain the desired low H+-ion concentration), and with... 

The mechanism of grafting polymer side chains to cellulose by Cerium (IV) ions is best understood by the oxidation of pinacol with ceric sulphate investigated 1959 by Mino, Kaizerman and Rasmussen... 

Ceric sulphate 15% aqueous H2SO4 saturated with ceric sulphate. 

The number-average molecular weights of starches have been determined by a procedure that involves oxidation of the polysaccharide with potassium hexa-cyanoferrate solution and potentiometric titration of ferrous ions with ceric sulphate. ... 

Other methods which have been suggested for total penicillins include one in which potassium ferricyanide is used as an oxidising agent, the excess ferricyanide being back-titrated with ceric sulphate and a method in which the /3-lactam structure of penicillin is reacted with an amine dye [AT-(l-naphthyl-4-azobenzene)ethylenediamine] to give a coloured condensation product. ... 

In the U.S.P, assay the quinone is first reduced before titration with ceric sulphate. 

---