Lewis Acid and Brønsted Bases

Acid and Base Definitions

Arrhenius, Brønsted-Lowry, and Lewis

Arrhenius Definition

• ACID - has H in formula and dissociates in water to produce H₃O⁺

• BASE - has OH in formula and dissociates in water to produce OH^-

Multiple Choice

Which of the following is an Arrhenius base?

• HNO₃

• H₂S

• HClO₄

• Sr(OH)₂

Brønsted-Lowry Definition

• ACID - H⁺ donor

• BASE - H⁺ acceptor

• Idea of conjugate acids and bases

Multiple Choice

What is the conjugate acid of HCO₃^-?

• CO₃^2-

• H₂CO₃

• HCO₃^2-

• CO₃^-

Multiple Choice

Will the conjugate base of a weak acid be strong or weak?

• Strong

• Weak

• Not enough information

Lewis Definition

• ACID - electron pair acceptor

• BASE - electron pair donor

Multiple Choice

Which is a Lewis acid?

• Ag⁺

• H₂O

• SO₄^2-

• NH₃