Calcium hydrogen orthoarsenate
- Empirical Formula: AsCaHO4
- Molecular Weight: 180.00514
What is Calcium hydrogen orthoarsenate?
Description
Calcium hydrogen orthoarsenate, CaHAsO4, may be prepared by treating calcium carbonate with arsenic acid, or by precipitation from solutions of calcium salts with sodium monohydrogcn arsenate. Both solutions should be acidified to around pH=9.0. When dried at 100°C the monohydrate, CaHAsO4·H2O, is obtained, but the water of crystallization is lost before the temperature of 175°C is reached. By very slow addition of sodium monohydrogen arsenate solution to a vessel containing aqueous calcium nitrate, so that the two salts were able to mix by diffusion, well-defined monoclinic prisms of the dihydrate, CaHAsO4·2H2O have been obtained. These two hydrates occur in Nature, the monohydrate as Haidingerite and the dihydrate as Pharmacolite. Calcium arsenate is a constituent of many other minerals. A saturated solution at 25°C of calcium monohydrogen arsenate contains 0.3108 g, of the anhydrous salt per 100 ml of solution.
Safety information for Calcium hydrogen orthoarsenate
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