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Ch.16 - Acids and Bases
Tro - Chemistry: A Molecular Approach 4th Edition
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Capitolo 16, Problema 37d

Write the formula for the conjugate base of each acid. d. HF

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1
Identify the acid in the problem, which is HF (hydrofluoric acid).
Recall that a conjugate base is formed when an acid donates a proton (H⁺).
Remove a proton (H⁺) from the acid HF.
After removing the proton, the remaining species is the conjugate base.
Write the chemical formula for the conjugate base, which is F⁻.

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Conjugate Acid-Base Pairs

In acid-base chemistry, a conjugate acid-base pair consists of two species that differ by the presence of a proton (H+). When an acid donates a proton, it forms its conjugate base, while the base that accepts the proton becomes its conjugate acid. Understanding this relationship is crucial for identifying the conjugate base of any given acid.
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Conjugate Acid-Base Pairs

Hydrofluoric Acid (HF)

HF is a weak acid that partially dissociates in water to produce hydrogen ions (H+) and fluoride ions (F-). The dissociation can be represented as HF ⇌ H+ + F-. Recognizing the behavior of HF as a weak acid helps in determining its conjugate base, which is the species remaining after the acid donates a proton.
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Binary Acid Identification Example

Identifying Conjugate Bases

To find the conjugate base of an acid, one must remove a proton from the acid's formula. For HF, removing H+ from HF leaves F-. This process is fundamental in acid-base reactions and is essential for predicting the behavior of acids and their corresponding bases in chemical reactions.
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Strength of Conjugate Acids and Bases