For this problem, we’re being asked to calculate the concentration of Pb2+ needed in order to precipitate PbF2 from a 1.00 x 10-2 M F- solution.
Dissociation reaction: PbF2(s) ⇌ Pb2+(aq) + 2F–(aq)
Step 1: ICE Chart
Step 2: Ksp expression
Note that each concentration is raised by the stoichiometric coefficient
What concentration of the lead ion, Pb2+ , must be exceeded to precipitate PbF2 from a solution that is 1.00?10?2 M in the fluoride ion, F? ? Ksp for lead(II) fluoride is 3.3?10?8 .
Frequently Asked Questions
What scientific concept do you need to know in order to solve this problem?
Our tutors have indicated that to solve this problem you will need to apply the Ksp concept. You can view video lessons to learn Ksp. Or if you need more Ksp practice, you can also practice Ksp practice problems.