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Ch.16 - Acid-Base Equilibria
Chapter 16, Problem 19b

What is the conjugate acid of HSO3-? What is its conjugate base?

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Conjugate Acid-Base Pairs

In acid-base chemistry, a conjugate acid is formed when a base gains a proton (H+), while a conjugate base is formed when an acid loses a proton. This relationship is essential for understanding how substances interact in chemical reactions, particularly in the context of the Brønsted-Lowry theory of acids and bases.
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HSO3- as a Base

HSO3- (bisulfite ion) acts as a base because it can accept a proton to form its conjugate acid, H2SO3 (sulfurous acid). Recognizing the role of HSO3- in acid-base reactions is crucial for determining its conjugate acid and base, as it highlights the dynamic nature of proton transfer in these processes.
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Identifying Conjugates

To identify the conjugate acid and base of a given species, one must consider the addition or removal of protons. For HSO3-, the conjugate acid is H2SO3, formed by adding a proton, while its conjugate base is SO3^2- (sulfite ion), formed by removing a proton. This systematic approach aids in understanding the behavior of acids and bases in various chemical contexts.
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