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Hi, The formla for Calcium phosphite (anhydrous) is CaH(PO3) It is more normally found as the monohydrate which has the formula Ca(HPO3).H2O It can be prepared by reacting phosphorous acid, H3PO3 and Calcium Oxide, CaO as follows; CaO + H3PO3 ---> CaHPO3 + H2O Hope this helps, Mike

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17y ago

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