Question 1

Identify the compound with the highest pKa.

Accepted Answer

A) CH3NH2 
B) CH3OH 
C) CH3COOH 
D) H2O 
E) CH3NH3+ 
A) CH3NH2 
B) CH3OH 
C) CH3COOH 
D) H2O 
E) CH3NH3+

Question 2

Identify the most acidic carboxylic acid.

Accepted Answer

A) ICH2COOH 
B) BrCH2COOH 
C) CH3COOH 
D) FCH2COOH 
E) ClCH2COOH 
A) ICH2COOH 
B) BrCH2COOH 
C) CH3COOH 
D) FCH2COOH 
E) ClCH2COOH

Question 3

Draw a resonance contributor and the resonance hybrid for HOCO2-.

Accepted Answer

resonance contributo

Question 4

The conjugate acid of H2O is ________.

Accepted Answer

A) H3O- 
B) H3O 
C) H3O+ 
D) HO- 
E) H2O+ 
A) H3O- 
B) H3O 
C) H3O+ 
D) HO- 
E) H2O+

Question 5

The pKa of CH3COOH is 4.8. If the pH of an aqueous solution of CH3COOH and CH3COO- is 4.8, then one knows ________.

Accepted Answer

A) CH3COOH is completely ionized 
B) [CH3COOH] > [CH3COO-] 
C) [CH3COOH] = [CH3COO-] 
D) [CH3COOH] 3COO-] 
E) CH3COOH is completely unionized 
A) CH3COOH is completely ionized 
B) [CH3COOH] > [CH3COO-] 
C) [CH3COOH] = [CH3COO-] 
D) [CH3COOH] 3COO-] 
E) CH3COOH is completely unionized

Question 6

What is the conjugate base of CH3NH2?

Accepted Answer

A) CH3NH3+ 
B) CH3NH- 
C) NH4+ 
D) NH2- 
A) CH3NH3+ 
B) CH3NH- 
C) NH4+ 
D) NH2-

Question 7

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

Accepted Answer

A) "H2O, HO-" 
B) "H2O, H3O+" 
C) "HSO4-, H2SO4" 
D) "-OH, O2-" 
E) "NO3-, NO2-" 
A) "H2O, HO-" 
B) "H2O, H3O+" 
C) "HSO4-, H2SO4" 
D) "-OH, O2-" 
E) "NO3-, NO2-"

Question 8

Explain why AlCl3 is a Lewis acid.

Accepted Answer

A Lewis acid is an electron pa

Question 9

Give the conjugate acid and the conjugate base for HSO4-.

Accepted Answer

conjugate

Question 10

Consider the set of compounds, NH3, HF, and H2O. Rank these compounds in order of increasing acidity and discuss your rationale.

Accepted Answer

NH₃ < H₂O < HF When determining relative a

Question 11

Identify the compound with the highest pKa.

Accepted Answer

A) CH3CH3 
B) HCCH 
C) CH2CH2 
D) CH3OH 
E) CH3NH2 
A) CH3CH3 
B) HCCH 
C) CH2CH2 
D) CH3OH 
E) CH3NH2

Question 12

Explain why : NF3 is a weaker base than : NH3.

Accepted Answer

Fluorine has an electron withd

Question 13

HCN has a pKa = 9.1. What form of the compound, HCN or CN-, will predominate in a solution of pH = 7.0

Accepted Answer

Question 14

Buffering is used to maintain the pH of human blood in the relatively narrow 7.3 - 7.4 range. What acid/base pair serves to buffer the blood?

Accepted Answer

A) H2O / HO- 
B) H3O+ / H2O 
C) H2CO3 / HCO3- 
D) NH4+ / NH3 
E) HCl / Cl- 
A) H2O / HO- 
B) H3O+ / H2O 
C) H2CO3 / HCO3- 
D) NH4+ / NH3 
E) HCl / Cl-

Question 15

Which of the following ions is the strongest acid?

Accepted Answer

A) H- 
B) HO- 
C) HSO4- 
D) H2O 
E) H3O+ 
A) H- 
B) HO- 
C) HSO4- 
D) H2O 
E) H3O+

Question 16

What is the pH of a 0.1 M solution of HCl? (Note: pKa for HCl is -6.)

Accepted Answer

A) 6 
B) -6 
C) 1 
D) -8 
E) -1 
A) 6 
B) -6 
C) 1 
D) -8 
E) -1

Question 17

What is the conjugate acid of NH3?

Accepted Answer

A) "+NH3" 
B) "-NH" 
C) "+NH4" 
D) "-NH2" 
E) "+NH2" 
A) "+NH3" 
B) "-NH" 
C) "+NH4" 
D) "-NH2" 
E) "+NH2"

Exam 2: Acids and Bases: Central to Understanding Organic Chemistry

Identify the compound with the highest pKa.

Identify the most acidic carboxylic acid.

Draw a resonance contributor and the resonance hybrid for HOCO2-.

The conjugate acid of H2O is ________.

The pKa of CH3COOH is 4.8. If the pH of an aqueous solution of CH3COOH and CH3COO- is 4.8, then one knows ________.

What is the conjugate base of CH3NH2?

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

Explain why AlCl3 is a Lewis acid.

Give the conjugate acid and the conjugate base for HSO4-.

Consider the set of compounds, NH3, HF, and H2O. Rank these compounds in order of increasing acidity and discuss your rationale.

Identify the compound with the highest pKa.

Explain why : NF3 is a weaker base than : NH3.

HCN has a pKa = 9.1. What form of the compound, HCN or CN-, will predominate in a solution of pH = 7.0

Buffering is used to maintain the pH of human blood in the relatively narrow 7.3 - 7.4 range. What acid/base pair serves to buffer the blood?

Which of the following ions is the strongest acid?

What is the pH of a 0.1 M solution of HCl? (Note: pKa for HCl is -6.)

What is the conjugate acid of NH3?

Remembering General Chemistry: Electronic Structure and Bonding

An Introduction to Organic Compounds

Isomers: the Arrangement of Atoms in Space

Alkenes Thermodynamics and Kinetics

Reactions of Alkenes

Reactions of Alkynes Introduction to Multistep Synthesis

Electron Delocalization, Resonance, and Aromaticity More About Molecular Orbital Theory

Substitution Reactions of Alkyl Halides

Elimination Reactions of Alkyl Halides Competition Between Substitution and Elimination

Reactions of Alcohols, Ethers, Epoxides, and Sulfur-Containing Compounds

Organometallic Compounds

Reactions of Alkanes, Radicals

Mass Spectrometry, Infrared Spectroscopy, and Uvvis Spectroscopy

Nmr Spectroscopy

Reactions of Carboxylic Acids and Carboxylic Acid Derivatives

Reactions of Aldehydes and Ketones

Reactions at the Alpha Carbon of Carbonyl Compounds

Reactions of Benzene and Substituted Benzenes

More About Amines Heterocylic Compounds

Carbohydrates

Amino Acids, Peptides, and Proteins

Catalysis

The Organic Mechanisms of the Coenzymes

The Chemistry of Metabolism

Nucleosides, Nucleotides, and Nucleic Acids

Synthetic Polymers

Pericyclic Reactions

Filters

Identify the compound with the highest pK_a.

Draw a resonance contributor and the resonance hybrid for HOCO₂^-.

The conjugate acid of H₂O is ________.

The pKa of CH₃COOH is 4.8. If the pH of an aqueous solution of CH₃COOH and CH₃COO^- is 4.8, then one knows ________.

What is the conjugate base of CH₃NH₂?

Explain why AlCl₃ is a Lewis acid.

Give the conjugate acid and the conjugate base for HSO₄^-.

Consider the set of compounds, NH₃, HF, and H₂O. Rank these compounds in order of increasing acidity and discuss your rationale.

Identify the compound with the highest pK_a.

Explain why : NF₃ is a weaker base than : NH₃.

HCN has a pKa = 9.1. What form of the compound, HCN or CN^-, will predominate in a solution of pH = 7.0

What is the pH of a 0.1 M solution of HCl? (Note: pK_a for HCl is -6.)

What is the conjugate acid of NH₃?