How many moles of naf must be dissolved in 1. 00 liter of a saturated solution of pbf2 at 25˚c to reduce the [pb2+] to 1 x 10–6 molar? (ksp pbf2 at 25˚c = 4. 0 x 10–8).

Need will give 100 ! in no less than one hundred fifty words, explain why it is important for engineers to sketch designs and use them to clarify their designs to other people, giving at least three reasons.