The reaction of palladium(II) salts with iron is a redox reaction that's why if a nail made of elemental iron [fe(s)] is placed in an aqueous solution of a soluble palladium(ii) salt [pd2+(aq)], the nail will gradually disappear.
Redox reactions are reactions in which electrons are donated or gained. One of the reactive species donates electrons and the other species gains electrons. Redox species lose or gain electrons depending on their position in the electrochemical sequence.
The reaction between palladium(II) salts and iron is a redox reaction because Fe(s) loses electrons and palladium(II) gains electrons. The oxidation number of Fe(s) increases from 0 to +2 and the br of palladium(II) decreases from +2 to 0. The reaction proceeds as follows:
[tex]Fe +Pd^{2+} = > Fe^{2+}+ Pd[/tex]
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