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Reduction of some quasi-reversibly reduced complexes of manganese (II) at the dme

✍ Scribed by D.S. Jain; N.K. Goswami; J.N. Gaur

Publisher
Elsevier Science
Year
1968
Tongue
English
Weight
404 KB
Volume
13
Category
Article
ISSN
0013-4686

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✦ Synopsis

The reduction of the complexes of Mn(I1) with formate and sulphate ions is quasireversible. The formation constants of the corn lexes have been determined by the polarographic meth od: of Mn(I1) with sulphate and formate ions The reversible half-wave potentials are calculated from the observed E,,, by Koryta's treatment for manganese-sulphate complexes and by Gellhrgs' treatment for manganese-formate complexes. The formation constants are calculated by DeFor d and Hume's method. With sulphate, three complex species, [Mn(SO,)], [Mn(SO&]x-and [Mn(S0,)sJ4-having p1 = 85 /II = 9-O and PI = 93 are formed. With formate, two complexes are formed, [Mn(HCOO)]+-and ~(I-ICOO),],

having /I1 = 3 and /3x = 15. The percentage distribution of various species present in manganes+formateandmanganes+sulphatesystemarepresented.

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A study of the electrochemical behaviour of Cu(II) at the hmde and dnw with citric acid as supporting electrolyte at different pHs is presented. The complex Cwcitrate species which originate the voltammetrlc curves are determined and the existence of a binuclear complex accounting for the appearance