Chemical Forums
Chemistry Forums for Students => Analytical Chemistry Forum => Topic started by: lcy2 on March 11, 2005, 04:51:00 PM
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will they react? cos' i put in a considerable amount of each, and all i've got is white cloud that should be CaCO3 and nothing more. Phenol shows. There is free flowing Cl- in solution, but i'm not sure whether it reacts to completion. CO2 is released after HCl has contact with the insoluble part.
Can someone please help me?
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There is no easy answer... You will have to check out cemplexation constants for CaClx, ZnClx, Ca(CO3)x, Zn(CO3)x and solubility proucts for ZnCO3 and CaCO3. Not to mention CO3(2-) hydrolysis and OH- complexes...
Basically ZnCO3 is about 100 times less soluble then CaCO3 so you may expect something like
ZnCl2(aq) + CaCO3(s) -> ZnCO3(s) + CaCl2
but it will be very slow and difficult to spot, as the solution will look all the same, with white precipitate.
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interesting. What i've found later in some books was...
the product: ZnCO3*2Zn(OH)2 + CO2 + 3CaCl2
the reactant has to also include H2O