What Is the Minimum Concentration of Cd²⁺ Required to Begin

question 19

Multiple Choice

What is the minimum concentration of Cd²⁺ required to begin precipitating Cd(OH) ₂(s) in a solution buffered at pH 10.83? The K_sp of Cd(OH) ₂ is 5.3 × 10^-15 and K_w = 1.01 × 10^-14.

• A) 3.4 × 10^-4 M
• B) 3.6 × 10^-4 M
• C) 7.8 × 10^-12 M
• D) 1.2 × 10^-8 M
• E) 4.5 × 10^-17 M

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