Define concentrations of acetic acid in a buffer solution

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Problem- What are the concentrations of acetic acid (pKa = 4.76) and acetate in a buffer solution of 0.10 M at pH 4.5? Enter your answer to two significant figures. (For example, 0.0090 and 0.0097 each have two significant figures, whereas 0.009 has only one significant figure.)

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