Chemistry

Chemistry

Problem

Spectroscopic data show that in a solution of the weak acid HAHA, about 90\% of the acid is present as HAHA and 10\% as A−A^-. Which statement best describes the relationship between the solution pH and the acid’s pKapK_a? a) pH≈pKa+1\text{pH} \approx pK_a + 1 b) pH≈pKa\text{pH} \approx pK_a c) pH≈pKa−1\text{pH} \approx pK_a - 1 d) pH≈pKa−2\text{pH} \approx pK_a - 2

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