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Barium Perchromate, BaCrO5

By treating chromic acid with an excess of hydrogen peroxide and decomposing the liquid obtained by cooled barium hydroxide solution, a very unstable, pale yellow-coloured precipitate of the Barium Perchromate, BaCrO5, is obtained. It may be washed by decantation and dried over sulphuric acid in vacuo. It is detonated by heat or shock. With dilute sulphuric acid it turns blue and gives up oxygen.

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