The ksp for calcium fluoride, caf2, is 1.5 x 10-10. a) excess solid calcium fluoride is added to 1.00 l of pure water. calculate the equilibrium concentration of calcium ion in the solution in moles/l. b) excess solid calcium fluoride is added to 1.00 l of 0.10 m sodium fluoride, naf. calculate the equilibrium concentration of calcium ion in the solution in moles/l.

Astudent made the lewis dot diagram of a compound as shown. mg is written with two dots shown on its top. an o is written on each side of mg. each o has six dots around it. an arrow is shown from one dot on mg toward the vacant space around the o on the right. another arrow is shown from the other dot on mg toward the vacant space around the o on the left. the title of the art is students lewis dot model. what is the error in the lewis dot diagram? an o atom should transfer all its six electrons to mg because the formula is mgo. both electrons of mg should be transferred to one o atom because the formula is mgo. the electrons should be transferred from each o atom to mg because mg has fewer electrons. the number of dots around mg should be four because it has to transfer two electrons to each o.