Question

Does a Precipitate form when Pb(No3)2 and ZnCl2 react?

Answer 1

look up a solubility table, check if combinations of PbCl2 and Zn(NO3)2 are soluble

Answer 2

To find the precipitate, you have to write the balanced equation and find if the products follow the solubility rules or not. You can look up the solubility rules online. The equation would look like:

Pb(NO3)2 + ZnCl2 → PbCl2+ Zn(NO3)2

PbCl2 is NOT soluble, because all chloride (Cl-) salts are soluble except for those of Ag+, Pb2+, and Hg22+.
Zn(NO3)2 is soluble, because all nitrate (NO3-) salts are soluble.

Answer: The precipitate that forms is from PbCl2 because it is not soluble.