Chintamani Posted October 22, 2004 Share Posted October 22, 2004 Can anyone help in suggesting method to manufacture Dicalcium Phosphate Anhydrous CaHPO4 [Mol.Wt.136] with no water of hydration from Commercial Grade Phosphoric Acid at Standard Temperature and Pressure? Link to comment Share on other sites More sharing options...
YT2095 Posted October 22, 2004 Share Posted October 22, 2004 Calcium Hydroxide and Phosphoric acid will give you your DiCalcium Phosphate precipitate, then when heated suitably the 2 h20 molecules in CaHPO4.2H2O. will leave you with your anhydrous CaHPO4 Link to comment Share on other sites More sharing options...
Chintamani Posted October 23, 2004 Author Share Posted October 23, 2004 Calcium Hydroxide and Phosphoric acid will give you your DiCalcium Phosphate precipitate, then when heated suitably the 2 h20 molecules in CaHPO4.2H2O. will leave you with your anhydrous CaHPO4 Thank you. But I was looking to precipitate Dicalcium Phosphate without 2 moles of hydration at room temperature Link to comment Share on other sites More sharing options...
budullewraagh Posted October 23, 2004 Share Posted October 23, 2004 it really shouldn't be a problem if you just heat your product. you see, if you use phosphoric acid and calcium hydroxide, you will need to do the reaction with water in the first place. it is not easy to perform such reactions without using a solvent such as water. Link to comment Share on other sites More sharing options...
Gilded Posted October 23, 2004 Share Posted October 23, 2004 Hey, what's up with water always dissolving things anyway? I've never really got that. Does it have something to do with attraction between the water molecules and crystal parts, causing the crystal then to break apart? Link to comment Share on other sites More sharing options...
budullewraagh Posted October 23, 2004 Share Posted October 23, 2004 water is really, really small and polar Link to comment Share on other sites More sharing options...
YT2095 Posted October 23, 2004 Share Posted October 23, 2004 Thank you. But I was looking to precipitate Dicalcium Phosphate without2 moles of hydration at room temperature sorry, I don`t know of any other way than using a Wet Reaction for this, and at room temp!? certainly no other way springs to mind. the method I outlined will give you your anhydrous product without fail, you`ll need a little heat to drive of the 2 water molecules though. Link to comment Share on other sites More sharing options...
raivo Posted October 23, 2004 Share Posted October 23, 2004 Many other solvents are as good as water but water is cheapest and most throughly researched. Its not easy to find solublity data even for most common substances if you plan to use ethylene glycol or pyridine as solvent. Also environment hazards are much greater than in case of water. Link to comment Share on other sites More sharing options...
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