Effect of fluoride, chloride, bromide, and thiocynate on potentiometric titrations of iron(II)-tin(II) mixtures with cerium(IV)

A two-step curve is expected in the potentiometric titration of Fe(II)-Sn(II) mixtures with Ce(IV) in H/sub 2/SO/sub 4/. Each end point should indicate the respective oxidation of Sn(II) and Fe(II). However, experimentally only one end point was found; it corresponded to the total oxidation of Sn(II...

Full description

Bibliographic Details
Main Author: Kwok, Y.M.
Language:unknown
Published: 2011
Subjects:
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
BROMIDES
CATALYTIC EFFECTS
CHLORIDES
FLUORIDES
IRON
POTENTIOMETRY
THIOCYANATES
TIN
BROMINE COMPOUNDS
CARBONIC ACID DERIVATIVES
CHEMICAL ANALYSIS
CHLORINE COMPOUNDS
DISPERSIONS
ELEMENTS
FLUORINE COMPOUNDS
HALIDES
HALOGEN COMPOUNDS
HYDROGEN COMPOUNDS
INORGANIC ACIDS
METALS
ORGANIC COMPOUNDS
ORGANIC SULFUR COMPOUNDS
RARE EARTHS
TITRATION
TRANSITION ELEMENTS
Carbonic acid
Online Access:http://www.osti.gov/servlets/purl/5103298
https://www.osti.gov/biblio/5103298
https://doi.org/10.2172/5103298
Description
Summary:A two-step curve is expected in the potentiometric titration of Fe(II)-Sn(II) mixtures with Ce(IV) in H/sub 2/SO/sub 4/. Each end point should indicate the respective oxidation of Sn(II) and Fe(II). However, experimentally only one end point was found; it corresponded to the total oxidation of Sn(II) and Fe(II). When this oxidation-reduction reaction was carried out in the presence of Cl/sup -/, the theoretical behavior was observed. The present study was done to ascertain if monovalent anions other than Cl/sup -/ have a similar effect on this oxidation-reduction system. The monovalent species F/sup -/, Br/sup -/, and SCN/sup -/ were selected for this study, and the results indicate that each affects the rate of reaction relative to the ease of oxidation of the individual ions.

Similar Items