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chem pleaseee - May 18th 2009, 01:08 AM

While trying to find solubility of AgCl(s)
why is it

K
sp = [Ag+(aq)][Cl-(aq)]

I thought when dissociating an element, it would would be something like:

AgCl(s) --> Ag + Cl2

Why is the Chlorine Cl-, and not Cl2?

thanks in advance!
   
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Re: chem pleaseee - May 19th 2009, 02:45 AM

Well, Cl is always Cl2 when it's on its own... But I guess it's different with solubility? I thought I knew, but I guess I don't! Just posting to say I wish I could help. :/ Sorry!


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Re: chem pleaseee - May 19th 2009, 07:20 AM

Your instinct to put Cl2 is a good one. Chlorine IS a diatomic molecule. The difference is, as Maeve guessed, that it's dissolving. When you dissolve silver chloride, you get silver ions (Ag+) and chloride ions (Cl-) dissociated in water. If it were just a regular dissociation, Cl2 would indeed be a product, but look at the state. It's Cl-[aq]. When an ion compound dissociates in water (dissolves), you just get ions, no molecules.


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