Consider a Buffer Solution Containing a Weak Acid, HX, and a Salt

question 57

Multiple Choice

Consider a buffer solution containing a weak acid, HX, and a salt of the weak acid's conjugate base, NaX. Under what conditions does the pH just equal the p K _a of the weak acid?

• A) When the p K _a equals 7.0.
• B) When [HX] > [NaX].
• C) When [HX] < [NaX].
• D) When [HX] = [NaX].
• E) When there is no NaX present.

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