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You Are Working on a Project to Recycle Nickel and Cadmium

Question 89

Multiple Choice

You are working on a project to recycle nickel and cadmium from old nickel-cadmium batteries that have an iron casing.The batteries are dissolved in aqueous nitric acid, producing a solution containing primarily Ni2+, Cd2+, and Fe3+ cations.One idea is to add sodium hydroxide to neutralize the acid and cause precipitation of Ni(OH) 2, Cd(OH) 2, and Fe(OH) 3.Assume the concentration of each of the cations is 0.100 M before the sodium hydroxide is added.The pH increases as the sodium hydroxide is added.Which compound will precipitate first, and what is the pH at that point? You are working on a project to recycle nickel and cadmium from old nickel-cadmium batteries that have an iron casing.The batteries are dissolved in aqueous nitric acid, producing a solution containing primarily Ni<sup>2+</sup>, Cd<sup>2+</sup>, and Fe<sup>3+</sup> cations.One idea is to add sodium hydroxide to neutralize the acid and cause precipitation of Ni(OH) <sub>2</sub>, Cd(OH) <sub>2</sub>, and Fe(OH) <sub>3</sub>.Assume the concentration of each of the cations is 0.100 M before the sodium hydroxide is added.The pH increases as the sodium hydroxide is added.Which compound will precipitate first, and what is the pH at that point?   A) Cd(OH) <sub>2</sub>; pH = 9.16 B) Fe(OH) <sub>3</sub>; pH = 4.81 C) Fe(OH) <sub>3</sub>; pH = 1.93 D) Cd(OH) <sub>2</sub>; pH= 6.42 E) Ni(OH) <sub>2</sub>; pH =7.24


A) Cd(OH) 2; pH = 9.16
B) Fe(OH) 3; pH = 4.81
C) Fe(OH) 3; pH = 1.93
D) Cd(OH) 2; pH= 6.42
E) Ni(OH) 2; pH =7.24

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