Platinum as a Chlorine Dioxide/Chlorite Redox Electrode in
that the potential of the platinum electrode in ClO2-based chemical oscillators is determined not by the I2/I-redox couple but by the Cl(+4)/Cl(+3) redox pair Under the applied experimental conditions, the contribution of other redox species (such as chloride, chlorine, hypochlorous acid, chlorate, iodide,
Chapter 6 66 Write the Nernst equation for? (a) The
If the points for Cl-and ClO 4-are connected by a straight line, Cl 2 lies above it Therefore, Cl 2 is thermodynamically susceptible to disproportionation to Cl-and C1O 4-when it is dissolved in aqueous base In practice, the oxidation of ClO-is slow, so a solution of Cl-and ClO-is formed when Cl 2 is dissolved in aqueous base (b) What
Fiche 3 : COUPLES et POTENTIELS REDOX
Couple redox e0 (volts) Couple redox e0 (volts) F2 /F-+ 2,87 H+ /H 2 0,00 O3 /O2 + 2,07 Pb 2+ / Pb - 0,13 S2O8 2-/ SO 4 2-+ 2,01 Sn2+ / Sn - 0,14 Co3+/ Co2+ + 1,82 Ni2+ / Ni - 0,25 H2O2/H2O + 1,77 Cr 3+ / Cr2+ - 0,40 ClO- /Cl-+ 1,71 Fe2+ / Fe - 0,44 MnO4-/MnO 2 + 1,69 CO2 / H2C2O4 - 0,49 Ce4+/Ce3+ + 1,61 S / S2-- 0,51 ClOH/Cl2 + 1,59 Cr 3+/ Cr
Relationships Between Oxidation-Reduction Potential, Oxidant
Key words: ORP, redox potential, redox chemistry, oxidant, drinking water 1 0 BACKGROUND 1 1 Redox Theory Oxidation-reduction (redox) reactions describe the transfer of electrons between atoms, molecules, or ions Oxidation and reduction reactions occur simultaneously and together make up an electrochemical couple
Redox Reactions and Electrochemistry
Example of balancing a redox reaction Determining sulphite in wastewater Sulphite is reacted with permanganate to produce sulphate and Mn(II) ion in acidic solution Balance the redox reaction SO 3 2-+ MnO 4-SO 4 2-+ Mn2+ skeleton reaction SO 3 2-SO 4 2-identify oxidation states +4 +6 SO 3 2-SO 4 + 2e-balance O S with e-’s SO 3 2-SO 4
OSBINCBSE
8 Define a redox couple Ans A redox couple is defined as having together oxidized and reduced forms of a substance taking part in an oxidation and reduction half – reaction 9 Explain why 3Fe3O4 (S) +8Al(S) -> 9Fe (S) +4Al2O3 Is an oxidation reaction ? Ans Aluminum is oxidized because oxygen is added to it Ferrous ferric oxide (Fe3O4) is
Redox equilibria in natural waters - Chem1
†Redox reactions tend to be kinetically inhibited, and are often extremely slow As a consequence of this, redox equilibrium is rarely achieved, either in natural waters or on the Earth as a whole †This kinetic sluggishness, upon which life itself depends, can be overcome by suitable enzymes
Chapter 23 - Potentiometry
Chapter 23 - - Potentiometry • Read: pp 659-680 Problems: 23-2,4,7,13,14 • Potentiometric methods are based upon measurements of the potential
Tables des potentiels standards
Chimie Supérieur www physiquechimie Page 2 sur 18 Document PbO2 Pb2+ 1,47 HNO2 N2 1,45 NO2 N2O 1,40 ClO4 Cl− 1,39 ClO4 Cl 2 1,39 Cl2aq Cl− 1,39 HCrO4 Cr3+ 1,38 NO2 N2 1,36
TD REACTIONS DOXYDOREDUCTION EN EXERCICE N°5: dismutation du
Ecrire la demi-équation électronique et la relation de Nernst pour le couple redox NO 3(aq)-/NO 2(g) auquel on associe le potentiel standardE° 1 Faire de même avec le couple NO 2(g)/NO 2(aq)-de potentiel standardE° 2 2 En présence d'eau, le dioxyde d'azote peut se dismuter en ions nitrates et nitrites 2 1
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