[s089708]

Hi everyone, it isn't clear to me why, (when using Mohr's method), the silver chloride percipitates first while its solubility product is higher than the solubility product of silver chromate? Every source tells me the product with the lowest solubility produduct, which in this case is the silverchromate, should precipitate first.
Pleas help me out
Thanks!


For AgCl, Ksol= 1.2 x 10^-10
For AgCrO4, Ksol = 1.7 x 10^-12

[Borek]

Every source tells me the product with the lowest solubility produduct, which in this case is the silverchromate, should precipitate first.

Nope, that's not how Ksp works. Or rather: it works this way sometimes, but you can't randomly select two salts and compare their Ksp.

Hint: it works when comparing AgBr with TlCl, but it doesn't work when comparing Ca₃(PO₄)₂ and Ag₂CO₃.