how to get PbCl2 from conc HCl and dilute HCl?

how to get PbCl2 from conc HCl and dilute HCl?


1 Answers

ruchi yadav
askIITians Faculty 27 Points
8 years ago
The solubility ofPbCl2in water is low (9.9 g/L at 20 °C) and for practical purposes it is considered insoluble. Its solubility-product constant (Ksp) at 25 °C (298 K) is 1.6 x 10-5. It is one of only three commonly insoluble chlorides: AgCl, Hg2Cl2, and PbCl. Now, the Ksp is defined at equilibrium as:
Ksp = [Pb(2+)]*[Cl-]^2
If [Cl-] increases slightly, since Ksp is just a constant, [Pb(2+)] has to decrease, and thus the solubility of PbCl2 is reduced by the presence of dilute HCl.
On the other hand, when the Cl- concentration is much higher, there are other two complexing reactions take place:
PbCl2(s) + Cl- ? [PbCl3]-(aq)
PbCl2(s) + 2Cl- ? [PbCl4]2-(aq)
These two complexing reactions make the solid PbCl2 become ions PbCl3- and PbCl4(2-), and thus dissolve again.

Thank You
Askiitians Faculty

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