KPCl6

Potassium hexachloroplatinate, with the chemical formula K2PtCl6, is an inorganic chemical compound. It appears as a yellow crystalline solid. This compound is a salt and is formed from the potassium cation (K+) and the hexachloroplatinate anion ([PtCl6]2-). It is moderately soluble in water.

K2PtCl6 has been historically significant in the study of platinum chemistry. It can be synthesized by reacting potassium hexachloroplatinate(IV) with potassium chloride. It is also known as potassium chloroplatinate or platinous potassium chloride.

In analytical chemistry, K2PtCl6 has been used as a precipitating agent for potassium ions, although this application is less common now due to the availability of more selective methods. It has also found limited use in some photographic processes. The compound is generally considered stable under normal conditions.