You Are Working on a Project to Recycle Nickel and Cadmium

question 62

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?

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

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