Blonde_At_Heart Posted January 8, 2009 Share Posted January 8, 2009 I have to decide whether the equation is: Synthesis Single Displacement Double Displacement Decomposition Combustion I know what to do for most of them, but one question baffles me. I already filled in the products and balanced the equation (hopefully correctly), and just need to know what type of reaction this is. 2 HCl + CaCO3 -> CO2 + H2O + CaCl2 I know it isn't synthesis or combustion, and single displacement doesn't sound right. I think it may be double displacement, but decomposition (though there are two reactants) sounds like the most probable answer. Any help would be greatly appreciated Link to comment Share on other sites More sharing options...
bob000555 Posted January 8, 2009 Share Posted January 8, 2009 It’s actually a double replacement then a decomposition: CaCO3 + 2HCl -> CaCl2 + H2CO3 H2CO3 -> H2O + CO2 H2CO3(carbonic acid) is a diol acid and thus very unstable decomposing to CO2 and H2O very quickly at room temperature. Link to comment Share on other sites More sharing options...
Blonde_At_Heart Posted January 8, 2009 Author Share Posted January 8, 2009 Oh, that makes perfect sense. Thank you so much! Link to comment Share on other sites More sharing options...
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