Primarygun Posted March 4, 2005 Share Posted March 4, 2005 Are we able to determine the amount of acid salt formed in the reaction between phosphoric acid and calcium hydroxide? If the ratio is 1:2. Is that possible for all salts to be that kind of salt? Link to comment Share on other sites More sharing options...
TWJian Posted March 4, 2005 Share Posted March 4, 2005 Ca(OH)2 + 2H3PO4 =Ca(H2PO4)2 +2H2O forms in excess of calcium hydroxide CaHPO4 might also form.(similiar to Na2SO4 and NaHSO4) Phosphoric acid is more complex and might form chains. Several salts will form but the main ones will be Ca(H3PO4)2 and CaHPO4 Link to comment Share on other sites More sharing options...
Primarygun Posted March 5, 2005 Author Share Posted March 5, 2005 So it's rather difficult for us to determine thw pH value of the mixed solution compared to the mixture of sodium hydroxide and phosphoric acid, right? Link to comment Share on other sites More sharing options...
TWJian Posted March 5, 2005 Share Posted March 5, 2005 So it's rather difficult for us to determine thw pH value of the mixed solution compared to the mixture of sodium hydroxide and phosphoric acid, right? Huh? We could just insert an electronic pH multimeter and it will tell the pH of the solution. Could you explain what you meant? The pH should be neutral if the reaction is complete. Link to comment Share on other sites More sharing options...
Primarygun Posted March 5, 2005 Author Share Posted March 5, 2005 Oh sorry. I asked wrongly. Theoretically to calculate Link to comment Share on other sites More sharing options...
budullewraagh Posted March 5, 2005 Share Posted March 5, 2005 Ca(OH)2+H3PO4-->Ca3(PO4)2+H2O with excess of Ca(OH)2 Link to comment Share on other sites More sharing options...
TWJian Posted March 6, 2005 Share Posted March 6, 2005 Oh sorry. I asked wrongly.Theoretically to calculate Phosphates makes the calculation hard since there are 3 main ions:phosphate ion(PO4 3-), hydrogen phosphate ion(HPO4 2-) and the dihydrogen phosphate ion(H2PO4 -) since phosphoric acid contains 3 hydrogen atoms for each molecule. I'm rather weak in acidity and basicity. Link to comment Share on other sites More sharing options...
budullewraagh Posted March 6, 2005 Share Posted March 6, 2005 the more hydronium cations that are displaced, the more difficult the others are to displace Link to comment Share on other sites More sharing options...
Tetrahedrite Posted March 6, 2005 Share Posted March 6, 2005 Ca(OH)2+H3PO4-->Ca3(PO4)2+H2Owith excess of Ca(OH)2 Adding excess Ca(OH)2 is more likely to form hydroxylapetite, Ca5(PO4)3(OH). Link to comment Share on other sites More sharing options...
budullewraagh Posted March 7, 2005 Share Posted March 7, 2005 oh good call. wow, i cant believe i forgot that. yeah, so pretty much you have tooth enamel. Link to comment Share on other sites More sharing options...
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