Textbook Question
Sodium amide (NaNH2) dissociates to give a sodium cation (Na+) and amide ion (NH2-) a very strong base. In the following three equations, identify which definition of base is being exemplified.
(a)
3. Acids and Bases
Acids and Bases
3:55 minutesProblem 10d
Textbook Question
What is the conjugate acid of each of the following bases? [The most basic atom is indicated.]
(d) 
Verified step by step guidance1
Identify the base provided in the problem. A base is a species that can accept a proton (H⁺). The most basic atom in the molecule is the one most likely to accept the proton.
Recall the definition of a conjugate acid: When a base accepts a proton (H⁺), it forms its conjugate acid. This involves adding an H⁺ to the most basic atom in the base.
Determine the structure of the conjugate acid by adding an H⁺ to the most basic atom. This may involve adjusting the formal charge of the atom that accepts the proton. For example, if the atom is neutral before accepting the proton, it will become positively charged after.
Write the chemical formula or structure of the conjugate acid, ensuring that the added H⁺ is correctly placed and the formal charges are updated.
Double-check the result to ensure that the conjugate acid is correctly derived from the base and that the most basic atom has been protonated.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Conjugate Acid-Base Theory
In acid-base chemistry, a conjugate acid is formed when a base accepts a proton (H+). This concept is central to understanding the relationship between acids and bases, where every base has a corresponding conjugate acid. For example, when ammonia (NH3) acts as a base and accepts a proton, it becomes ammonium (NH4+), its conjugate acid.
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Basicity and pKa
Basicity refers to the ability of a substance to accept protons, and it is often quantified by the pKa value of its conjugate acid. A lower pKa indicates a stronger acid, which corresponds to a weaker base. Understanding the pKa values helps predict the strength of bases and their corresponding conjugate acids, aiding in identifying the correct conjugate acid for a given base.
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Proton Transfer Reactions
Proton transfer reactions are fundamental in acid-base chemistry, where the transfer of a proton from an acid to a base occurs. This process is essential for determining the conjugate acid of a base. Recognizing the most basic atom in a molecule helps identify where the proton transfer will occur, leading to the formation of the conjugate acid.
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