They possess high positive reduction potentials (e.g.,
) to nitrogen gas, while Pt and Pd oxidize carbon monoxide and unburnt hydrocarbons.
Most are insoluble in standard acids. Gold and platinum require Aqua Regia (a 3:1 mixture of HClcap H cap C l HNO3cap H cap N cap O sub 3 HNO3cap H cap N cap O sub 3 acts as an oxidant, while the Cl−cap C l raised to the negative power Chemistry of Precious Metals
Precious metals display a wide variety of oxidation states, though they generally prefer low-spin configurations: Predominantly +1positive 1 . It forms linear complexes like Gold (Au): Commonly +1positive 1 +3positive 3 typically adopts a square planar geometry.
Notable for reaching very high oxidation states. Osmium tetroxide ( OsO4cap O s cap O sub 4 ) features Os in the +8positive 8 state and is a powerful (though toxic) oxidizing agent. 5. Emerging Applications: Photochemistry and Medicine Cancer Treatment: Cisplatin ( They possess high positive reduction potentials (e
Metals like Palladium (Pd) and Platinum (Pt) have a high affinity for hydrogen and unsaturated hydrocarbons. Pd can absorb up to 900 times its own volume of hydrogen gas, making it essential for hydrogenation reactions.
The most significant chemical application of precious metals is in . It forms linear complexes like Gold (Au): Commonly
Precious metals are often called "noble" because they resist oxidation and protonic acids.