Palladium: reactions of elements
Reaction of palladium with air
Heating palladium metal with oxygen results in formation of palladium(II) oxide, PdO.
2Pd(s) + O2(g) → PdO(s) [black]
Reaction of palladium with water
Reaction of palladium with the halogens
Careful control of the reaction between palladium metal and fluorine gas, F2, results in either the palladium trifluoride. This compound is not palladium(III) fluoride but the mixed valence Pd(II,IV) salt [Pd]2+[PdF6]2-.
2Pd(s) + 3F2(g) → [Pd][PdF6](s)
The dichloride, palladium(II) chloride, PdCl2, is also formed in the controlled reaction of palladium metal and chlorine, Cl2. Depending upon the reaction conditions, one of two different forms of PdCl2 is formed. In a related reaction, the dibromide, palladium(II) bromide, PdBr2, is formed in the reaction of palladium metal and bromine, Br2.
Pd(s) + Cl2(g) → PdCl2(s) [red, second form colour ...?]
Pd(s) + CBr2(g) → PdBr2(s) [red-black]