Precipitation formation?

Question

What is the largest mass of solid NaCl that can be dissolved in 1.000L of 5.00e-3M AgNO3 without a precipitate of AgCl forming? Ksp for AgCl is 1.8e-10

a)0.78 mg
b)86 ug
c)13 ug
d)2.1 ug
e)36 ng

Is it e?

Answer 1

From your Ksp, determine [Cl-] max if Ag= 5x10-3 mole/L. Call this Z. Now find 58Z (note=58 is mole wt of NaCl). Check against answers, noting your calc is in GRAMS.