Z^- Is a Weak Base

question 31

Multiple Choice

Z^- is a weak base. An aqueous solution of NaZ is prepared by dissolving 0.350 mol of NaZ in sufficient water to yield 1.0 L of solution. The pH of the solution was 8.93 at 25.0°C. The K_b of Z^- is __________.

• A)1.2 × 10^-5
• B)6.9 × 10^-9
• C)2.1 × 10^-10
• D)9.9 × 10^-2
• E)2.8 × 10^-12

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