Which of the following do you need to know to be able to calculate the molarity

Question

Which of the following do you need to know to be able to calculate the molarity of a slat solution? Which of the following will occur when aqueous solutions of zinc(II) bromide and silver(I) nitrate are mixed? No precipitate will form. AgBr will precipitate. Zn^2 and NO_3^- will be spectator ions. ZnBr will precipitate. Ag^+2 and NO_3^- will be spectator ions. Zn(NO_3)_2 will precipitate. Ag^+ and Br^- will be spectator ions. AgBr_2 will precipitate. Zn^+ and NO_3^-2 will be spectator ions. If you wanted to remove Pb^+2 from an aqueous solution by precipitation, you might add a salt containing which of the following ions?

Explanation / Answer

answer
18. (D)
19. (D)
20. (A)

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