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Polarography of hexavalent molybdenum in hydrochloric acid

1962; Pergamon Press; Volume: 24; Issue: 6 Linguagem: Inglês

10.1016/0022-1902(62)80085-2

1878-1225

G. P. Haight,

Electrocatalysts for Energy Conversion

Solutions containing hydrochloric acid in concentrations less than 1·0 molar and molybdate ions in concentrations less than 10−4 molar give polarograms containing one or three waves. The single wave observed in 0·5–0·7 M hydrochloric acid and the middle wave of the three observed in more dilute acid have reversible two electron characteristics. The half-wave potential of this wave is given by the equation: E12 = − 0·080 0·12 log (H+) + 0·035 log (Cl−) corresponding to the electrochemical equation: Mo(VI) + 4H+ + Cl− + 2e → Mo(IV) Evidence that the chemically unstable Mo(IV) is the primary reduction product is discussed.