A solution is 0.010 M in each of Pb(NO₃)₂,Mn(NO₃)₂,and Zn(NO₃)₂.Solid NaOH is added until the pH of the solution is 8.50.Which of the following statements is true? A)No precipitate will form. B)Only Pb(O H)₂ will precipitate. C)Only Mn(O H)₂ will precipitate. D)Only Zn(O H)₂ and Pb(O H)₂ will precipitate. E)All three hydroxides will precipitate.

Question

Quizplus · Accepted Answer

When NaOH is added to the solution, it will react with the metal cations to form the corresponding hydroxides. Lead(II) hydroxide (Pb(OH)2), manganese(II) hydroxide (Mn(OH)2), and zinc(II) hydroxide (Zn(OH)2) are all insoluble in water and will precipitate out of solution. The pH of the solution is adjusted to 8.50 to ensure that hydroxide ions are present to react with the metal cations. Therefore, the correct answer is D, as both Pb(OH)2 and Zn(OH)2 will precipitate.

A Solution Is 0