Conjugate Acids and Bases Concepts

The video tutorial explains the Bronsted-Lowry theory, defining acids as proton donors and bases as proton acceptors. It illustrates this with a weak acid equilibrium example, showing how HA donates a proton to B, forming A- and BH+. The tutorial emphasizes the concept of conjugate acid-base pairs, which differ by one proton. It also guides viewers on identifying these pairs and warns against common mistakes, such as confusing compounds that differ by more than one proton or by other atoms.

What is the primary role of a Bronsted-Lowry acid in a chemical reaction?

• To donate an electron

• To accept an electron

• To accept a proton

• To donate a proton

In the context of weak acids, what happens when HA donates a proton to B?

• HA becomes A-

• B becomes A-

• HA becomes BH+

• B becomes HA

What is the term used for the species A- in the reaction where HA donates a proton?

• Conjugate base

• Conjugate acid

• Neutral species

• Proton donor

Which of the following pairs correctly represents a conjugate acid-base pair?

• HCl and Cl2

• H2O and OH-

• H2PO4- and HPO4^2-

• HNO3 and H3O+

Why is the pair HNO3 and H3O+ not considered a conjugate acid-base pair?

• They are both acids

• They differ by two protons

• They differ by one oxygen atom

• They do not differ by one proton

What is a common mistake when identifying conjugate acid-base pairs?

• Identifying pairs with different charges

• Selecting pairs with the same number of protons

• Confusing acids with bases

• Choosing pairs that differ by more than one proton

Which choice represents a pair that differs by only one proton?

• NH3 and NH4+

• HCl and Cl2

• H2PO4- and HPO4^2-

• H2O and H2O2

What is the correct conjugate base of H2PO4-?

• HPO3^2-

• PO4^3-

• HPO4^2-

• H3PO4

Which of the following is NOT a characteristic of a conjugate acid-base pair?

• They can interconvert by gaining or losing a proton

• One is an acid, the other is a base

• They have the same charge

• They differ by one proton

In the example given, what does HPO4^2- become when it gains a proton?

• H3PO4

• PO4^3-

• HPO3^2-

• H2PO4-