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Thorium Arsenates

Thorium hydrogen arsenate,Th(HAsO4)2.6H2O, is precipitated in a crystalline form when a 40 per cent, solution of arsenic acid is added to a boiling solution of thorium nitrate containing 2 per cent, of thoria. Thorium dihydrogen arsenate, Th(H2AsO4)4.4H2O, is obtained as a crystalline precipitate when a solution of thorium nitrate containing 5 per cent, of thoria is treated with a 50 per cent, solution of arsenic acid.
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