HZ Is a Weak Acid

question 133

Multiple Choice

HZ is a weak acid.An aqueous solution of HZ is prepared by dissolving 0.020 mol of HZ in sufficient water to yield 1.0 L of solution.The pH of the solution was 4.93 at 25.0 °C.The K_a of HZ is ________.

• A)1.2 × 10^-5
• B)6.9 × 10^-9
• C)1.4 × 10^-10
• D)9.9 × 10^-2
• E)2.8 × 10^-12

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