A 00010 M Solution of a Weak Acid,HA,with K_a = 2

question 67

Multiple Choice

A 0.0010 M solution of a weak acid,HA,with K_a = 2 * 10^-10 produces [H₃O⁺] < 10^-6 M.Which of the following equations can be used to determine [H₃O⁺]?

• A)The acid is so weak that the pH is about 7.
• B)[H₃O⁺]² + K_a [H₃O⁺] - [HA]_initialK_a = 0
• C)[H₃O⁺] = (K_w + K_a[HA]_initial)^½
• D)[H₃O⁺] = [HA]_initial
• E)[H₃O⁺] = (K_a[HA]_initial)^½

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