HChem Lewis acids and bases

Lewis acid-base theory

Bromfield Honors Chemistry

​transition metal cations
often act as Lewis acids

​Example 2

Identify the Lewis acid and the Lewis base:

Fe³⁺(aq) + SCN^-(aq) ⇌ [FeSCN]²⁺(aq)

Multiple Choice

What is a Lewis acid?

• A Lewis acid is a substance that increases pH.

• A Lewis acid is an electron pair donor.

• A Lewis acid is a proton donor.

• A Lewis acid is an electron pair acceptor.

Multiple Choice

Which type of bond is formed when a Lewis acid reacts with a Lewis base?

• coordinate covalent bond

• ionic bond

• metallic bond

• hydrogen bond

Multiple Choice

What is a Lewis base?

• A Lewis base is an electron pair acceptor.

• A Lewis base is a proton donor.

• A Lewis base is an electron pair donor.

• A Lewis base is a substance that increases the concentration of hydroxide ions.

Multiple Choice

Identify the Lewis acid in the reaction: AlCl₃ + Cl^- ⟶ AlCl₄^-

• AlCl₃

• Cl^-

• AlCl₄^-

Multiple Choice

In the reaction: Fe³⁺ + 6H₂O ⟶ [Fe(H₂O)₆]³⁺, classify H₂O as a Lewis acid or Lewis base.

• Lewis acid

• Lewis base

Multiple Choice

Identify the Lewis acid in the reaction: Zn²⁺ + 4NH₃ ⟶ [Zn(NH₃)₄]²⁺

• NH₃

• Zn²⁺

• Zn

• [Zn(NH₃)₄]²⁺

Multiple Choice

Identify the Lewis base in the reaction: Fe³⁺ + 6F^- ⟶ [FeF₆]^3-

• Fe3+

• [FeF₆]^3-

• F₂

• F^-

Open Ended

List at least two important things you should remember from this activity!