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? Salt K_sp Pb(OH)₂ 1)4 × 10^-20 Mn(OH)₂ 2)0 × 10^-13 Zn(OH)₂ 2)1 × 10^-16 A)Only Mn(OH)₂ will precipitate. B)All three hydroxides will precipitate. C)Only Pb(OH)₂ will precipitate. D)No precipitate will form. E)Only Zn(OH)₂ and Pb(OH)₂ will precipitate.

Question

Quizplus · Accepted Answer

Adding NaOH will cause the solution to become more basic and the metal ions to form their respective hydroxides. The solubility product constant for Pb(OH)2 is much lower than that for Mn(OH)2 and Zn(OH)2, so Pb(OH)2 will precipitate first. Once all the Pb2+ ions have reacted, the remaining hydroxide ions will react with Mn2+ and Zn2+ to form their respective hydroxides. Therefore, only Zn(OH)2 and Pb(OH)2 will precipitate.

A Solution Is 0