HX is generally used as a buffer. If pH 8.0 is a good buffering region for X, then:
I. the pKa of HX must be near pH 8.0
II. if HX is titrated with acid, the titration curve will possess a steep region near pH 8.0.
III. a great deal of NaOH would have to be added to pH 8.0 HX in order to significantly affect the pH.
A. I only
B. III only
C. I and II only
D. I and III only
I picked A because I is ture. III could be true but that depend on how concentrated the X and HX are to started with.
However the book say it is D.
What do you think?
I. the pKa of HX must be near pH 8.0
II. if HX is titrated with acid, the titration curve will possess a steep region near pH 8.0.
III. a great deal of NaOH would have to be added to pH 8.0 HX in order to significantly affect the pH.
A. I only
B. III only
C. I and II only
D. I and III only
I picked A because I is ture. III could be true but that depend on how concentrated the X and HX are to started with.
However the book say it is D.
What do you think?
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