How many grams of PbF2 (molar mass = 245.2) will dissolve in 700 mL of 0.70 M NaF solution? The Ksp for PbF2 is 2.69e-08.

PLEASE HELP
I thought the answer was suppose to be 6.6e-6, and I dont know what I did wrong. :(((

can someone please help me??