USA: +1 (725) 712-1730 
Sign in
A solution of lead acetate, calcium nitrate, and magnesium chloride are mixed. The resulting solution is 0.055M in Pb(C_2H_3O_2)_2, 0.015M in Ca(NO_3)_2 and 0.035M in MgCl_2. Will a precipitate form in the mixed solution? If so identify the precipitate
Expert Answer
Yes , precipitate will form in the mixed solution
The precipitate is PbCl2
Explanation
The equillibrium involved in solubility of PbCl2 is
PbCl2(s) <——-> Pb2+(aq) + 2Cl-(aq)
solubility product, Ksp = [ Pb2+ ] [ Cl- ]^2 = 1.7×10^-4
solubility product quotient,
Qsp = [ Pb2+ ] × [ Cl- ]^2
[ Pb( C2H3O2)2] = 0.055M
Pb(C2H3O2)2 contain 1 Pb
So , [ Pb2+ ] = 0.055M
[ MgCl2 ] = 0.035M
MgCl2 contain 2Cl
so, [ Cl- ] = 0.070M
Therefore,
Qsp = (0.055) ×(0.070)^2
= 2.7×10^-4
So, Qsp > Ksp
Therefore, precipitation of PbCl2 will form
