Conversion of iron(II) ion to iron(III) ion and Vice Versa - SPM Corner

Conversion of Fe2+ to Fe3+ and vice versaSPM 2008Paper 2 Q7Suggested Answer Fe3+  Fe2+  Fe2+  Fe3+  Reducing agent is zinc. Halogen is bromine. Add zinc to a solution containing  Add bromine water to a solution Fe3+.containing Fe2+. Heat the mixture. Filter the mixture. Shake the mixture. Add sodium hydroxide solution. Add sodium hydroxide solution. A green precipitate is formed. Brown precipitate is formed.chem2u.blogspot.comConversion of Fe2+ to Fe3+ and vice versaSPM 2009Paper 2Suggested Answer A suitable metal is zinc The oxidation number of zinc increases from 0 to +2 Zinc undergoes oxidation.  Zinc is a reducing agent The half-equation: Zn  Zn2+ + 2e- The ion present in the green solution is iron(II) ion. The oxidation number of iron decreases from +3 to +2 Iron(III) ion undergoes reduction.  Iron(III) ion is a reducing agent The half-equation: Fe3+ + e-  Fe2+chem2u.blogspot.com