High Quality Content by WIKIPEDIA articles! Praseodymium(III) chloride (PrCl3), also known as praseodymium trichloride, is a compound of praseodymium and chlorine. It is a blue-green solid which rapidly absorbs water on exposure to moist air to form a light green heptahydrate. Praseodymium(III) chloride is a moderately strong Lewis acid, which ranks as "hard" according to the HSAB concept. Rapid heating of the hydrate may cause small amounts of hydrolysis. PrCl3 forms a stable Lewis acid-base complex K2PrCl5 by reaction with potassium chloride; this compound shows interesting optical and magnetic properties. Aqueous solutions of praseodymium(III) chloride can be used to prepare insoluble praseodymium(III) compounds. Praseodymium(III) chloride can be prepared as a green aqueous solution by reaction of either praseodymium metal or praseodymium(III) carbonate with hydrochloric acid.

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