Palladium(II) chloride, also known as palladium dichloride, are the chemical compounds with the formula PdCl2. PdCl2 is a common starting material in palladium chemistry – palladium-based catalysts are of particular value in organic synthesis. It is prepared by chlorination of palladium.
Even when dry, palladium(II) chloride is able to rapidly stain stainless steel. Thus, palladium(II) chloride solutions are sometimes used to test for the corrosion-resistance of stainless steel.
It is sometimes used in carbon monoxide detectors. Carbon monoxide reduces palladium(II) chloride to palladium:
PdCl2 + CO + H2O → Pd + CO2 + 2HCl
Residual PdCl2 is converted to red PdI2, the concentration of which may be determined colorimetrically:
PdCl2 + 2 KI → PdI2 + 2 KCl
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