A50.0 ml sample of a cu(no3)2 solution, which
is a blue solution, and a naoh solution, which is
colorless, are combined forming a blue cu(oh)2
(molar mass 81.5) precipitate. the 0.815 g
precipitate is collected through filtration, and the
colorless filtrate is set apart. what is the
concentration of the original cu(no3)2 solution?
(a) 0.10 m
(b) 0.20 m
(c) 0.40 m
(d) the concentration of cu(no3)2 solution
cannot be determined because it was the
excess reactant.

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.