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Potassium Aquo-chlor-ruthenate, K2Ru(OH2)Cl5

Potassium Aquo-chlor-ruthenate, K2Ru(OH2)Cl5, results on boiling a slightly acidified solution of potassium chlor-ruthenite; K2RuCl5, with alcohol; as also by heating the hydrated sesquioxide with hydrochloric acid and alcohol.

Upon evaporation the salt crystallises in orthorhombic octahedra, which are soluble in water. The solution yields with alkalies a dirty white precipitate which soon becomes black, thereby differing from solutions of the trichloride, which give an immediate black precipitate under such conditions.

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