Will it Precipitate???

Question

1.0 mg of NaI is added to 50.0 mL of a 0.010 mol/Lsolution of Pb(NO3)2. Does a precipitate form?? Ksp of PbI2 is 9.8*10^-9

Answer 1

0.001 g NaI @ 149.89 g/mol = 6.67e-6 moles iodide

6.67e-6 moles iodide/ 0.050 litres =1.33e-4 Molar iodide

Q = [Pb+2] [I-]^2

Q = [0.01] [1.33e-4]^2

Q = 1.78e-10

Q is less than Ksp, it is unsaturated...

your answer is: no ppt