Palladium(II) chloride

• Palladium dichloride
• Palladium dichloratum (Latin )

Red to dark brown powder or crystals

Fixed

4.0 g · cm -3 ( 20 ° C)

590 ° C

Sparingly soluble in water

Attention

2700 mg · kg -1 ( LD50, rat, oral)

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Palladium (II ) chloride, palladium salt of hydrochloric acid.

Production and representation

Palladium (II ) chloride is obtained by dissolving palladium metal in aqua regia or hydrochloric acid in the presence of chlorine. Alternatively, it may be obtained by heating palladium sponge in chlorine gas at 500 ° C.

Properties

Physical Properties

α - palladium (II ) chloride forms red rhombohedral crystals that dissolve slowly in water with red paint to form PdCl2 ( H2O) 2. It is also soluble in ethanol and acetone. It dissolves quickly in hydrochloric acid. It is almost odorless and slightly hazardous for water.

Chemical Properties

Palladium (II ) chloride decomposes above 600 ° C in palladium and chlorine. It dissolves in hydrochloric acid, forming a tetrachloropalladate [ PdCl4 ] 2 -:

This catalyses various organic reactions such as the oxidation of ethylene to acetaldehyde ( Wacker process ).

Upon initiation of hydrogen sulfide precipitates brown - black palladium monosulfide PdS.

When heated with sulfur at 450 to 500 ° C formation of Palladiumdisulfid pDS2.

Upon initiation of ammonia in the aqueous solution form tetrammine palladium ( II ) chloride [Pd (NH3 ) 4] Cl2, also in dry PdCl2.

Use

Palladium ( II) chloride is a starting material for a variety of palladium compounds. It is also used for the detection of carbon monoxide. For this paper is soaked in a very dilute PdCl2 solution. This is colored black by CO or other reducing substances with deposition of metallic palladium. It is also used in the electroplating solutions and porcelain images.