Question

Question: Draw the products of each acid–base reaction. Indicate whether equilibrium favors the reactants or products.

a.

b.

c.

Short answer

Answer

a.

b.

c.

Step-by-step solution

Equilibrium  

The pK_a of many protonated amines is 10–11. So, the pK_a of the starting acid must be less than 10 for the equilibrium to favor the products.

Amines are thus readily protonated by strong inorganic acids, such as HCl and H₂SO₄ and by carboxylic acid (organic acid) as well.

Explanation

a. The reaction of the butane amine is represented as

pK_avalues of HCl is -7

The pK_a of the product is 10. Therefore, the product is a weaker acid.

b. The reaction of the piperidine with water does not favor the product, as shown below.

Favored equilibrium

c. The reaction of the given amine is represented a

pK_a value of CH₃COOH is 4.2

pK_a (CH₃)₂NH₂⁺ is 10.7