Question 1

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 C

Question 2

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. C

Question 3

Which of the following anions,CH3CHBrCO2- or CH3CHFCO2- is the stronger base? Explain your choice.

Accepted Answer

CH₃CHBrCO₂^- is the stronger base.The more electronegative F atom can more effectively delocalize the negative charge via induction.This greater delocalization stabilizes CH₃CHFCO₂^-relative to CH₃CHBrCO₂^- and makes it a weaker base.

Question 4

The pKa of CH3COOH is 4.8 and the pKa of HCOOH is 3.8.Given this information,one knows that

Accepted Answer

A) CH3COOH completely ionizes in water. 
B) HCOOH is a weaker acid than CH3COOH. 
C) HCOO- is a weaker base than CH3COO-. 
D) CH3COOH reacts with HO- while HCOOH does not. 
E) HCOOH reacts with HO- while CH3COOH does not. 
A) CH3COOH completely ionizes in water. 
B) HCOOH is a weaker acid than CH3COOH. 
C) HCOO- is a weaker base than CH3COO-. 
D) CH3COOH reacts with HO- while HCOOH does not. 
E) HCOOH reacts with HO- while CH3COOH does not.

Question 5

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 6

What is the conjugate acid of CH3NH2?

Accepted Answer

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

Question 7

Which species act as bases in the following reaction?

Accepted Answer

A) 1 and 2 
B) 3 and 4 
C) 2 and 4 
D) 1 and 3 
E) 2 and 3 
A) 1 and 2 
B) 3 and 4 
C) 2 and 4 
D) 1 and 3 
E) 2 and 3

Question 8

Explain why AlCl3 is a Lewis acid.

Accepted Answer

A Lewis acid is an electron pa

Question 9

Write a completed equation for the acid-base pair shown below.
HCO2H + -NH2 →

Accepted Answer

HCO₂H + ^-NH₂

Question 10

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

Accepted Answer

conjugate

Question 11

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 12

The amino acid glycine (H3N+CH2CO2H)has two acidic Hs,one with pKa = 2.34 and the other with pKa=9.60.Draw the structure of the form of glycine that predominates at a pH of 12.

Accepted Answer

Question 13

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

Accepted Answer

Fluorine has an electron withd

Question 14

When a small amount of hexanoic acid [CH3(CH2)4CO2H,pKa~4.8],is added to a separatory funnel which contains the organic solvent diethyl ether and water with a pH of 2.0,it is found mainly in the ________ phase as ________.

Accepted Answer

A) ether; CH3(CH2)4CO2- 
B) water; CH3(CH2)4CO2- 
C) ether; CH3(CH2)4CO2H 
D) water; CH3(CH2)4CO2H 
E) none of the above 
A) ether; CH3(CH2)4CO2- 
B) water; CH3(CH2)4CO2- 
C) ether; CH3(CH2)4CO2H 
D) water; CH3(CH2)4CO2H 
E) none of the above

Question 15

Which of the following is the strongest acid?

Accepted Answer

A) CH3CH2OH 
B) CH3OCH3 
C) CH3-NH-CH3 
D) CH3-C   CH 
E) CH3-CH   CH2 
A) CH3CH2OH 
B) CH3OCH3 
C) CH3-NH-CH3 
D) CH3-C   CH 
E) CH3-CH   CH2

Question 16

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)

Question 17

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 18

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 19

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 20

Which of the following species cannot function as a Lewis acid?

Accepted Answer

A) H+ 
B) TiCl4 
C) AlCl3 
D) NH4+ 
E) H2O 
A) H+ 
B) TiCl4 
C) AlCl3 
D) NH4+ 
E) H2O

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

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

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

Which of the following anions,CH3CHBrCO2- or CH3CHFCO2- is the stronger base? Explain your choice.

The pKa of CH3COOH is 4.8 and the pKa of HCOOH is 3.8.Given this information,one knows that

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?

What is the conjugate acid of CH3NH2?

Which species act as bases in the following reaction?

Explain why AlCl3 is a Lewis acid.

Write a completed equation for the acid-base pair shown below. HCO2H + -NH2 →

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

Identify the most acidic carboxylic acid.

The amino acid glycine (H3N+CH2CO2H)has two acidic Hs,one with pKa = 2.34 and the other with pKa=9.60.Draw the structure of the form of glycine that predominates at a pH of 12.

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

When a small amount of hexanoic acid [CH3(CH2)4CO2H,pKa~4.8],is added to a separatory funnel which contains the organic solvent diethyl ether and water with a pH of 2.0,it is found mainly in the ________ phase as ________.

Which of the following is the strongest acid?

What is the conjugate acid of NH3?

Which of the following ions is the strongest acid?

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

Identify the compound with the highest pKa.

Which of the following species cannot function as a Lewis acid?

Remembering General Chemistry: Electronic Structure and Bonding

An Introduction to Organic Compounds: Nomenclature, physical Properties, and Structure

Isomers: the Arrangement of Atoms in Space

Alkenes: Structure,nomenclature,and an Introduction to Reactivity - Thermodynamics and Kinetics

The Reactions of Alkenes - the Stereochemistry of Addition Reactions

The Reactions of Alkynes - Introduction to Multistep Synthesis

Delocalized Electrons: Their Effect on Stability, pka, and the Products of a Reaction - Aromaticity and Electronic Effects: an Introduction to the Reactions of Benzene

Substitution and Elimination Reactions of Alkyl Halides

Reactions of Alcohols, ethers, epoxides, amines and Sulfur-Containing Compounds

Organometallic Compounds

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 Α-Carbon

Reactions of Benzene and Substituted Benzenes

More About Amines - Reactions of Heterocylic Compounds

The Organic Chemistry of Carbohydrates

Amino Acids,peptides,and Proteins

Catalysis in Organic Reactions and in Enzymatic Reactions

The Organic Chemistry of the Coenzymes, compounds Derived From Vitamins

The Organic Chemistry of the Metabolic Pathways

The Organic Chemistry of Lipids

The Chemistry of the Nucleic Acids

Synthetic Polymers

Pericyclic Reactions

Filters

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

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

Which of the following anions,CH₃CHBrCO₂^-or CH₃CHFCO₂^- is the stronger base? Explain your choice.

The pKa of CH₃COOH is 4.8 and the pKa of HCOOH is 3.8.Given this information,one knows that

What is the conjugate acid of CH₃NH₂?

Explain why AlCl₃ is a Lewis acid.

Write a completed equation for the acid-base pair shown below. HCO₂H + ^-NH₂ →

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

The amino acid glycine (H₃N⁺CH₂CO₂H)has two acidic Hs,one with pKa = 2.34 and the other with pKa=9.60.Draw the structure of the form of glycine that predominates at a pH of 12.

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

When a small amount of hexanoic acid [CH₃(CH₂)₄CO₂H,pKa~4.8],is added to a separatory funnel which contains the organic solvent diethyl ether and water with a pH of 2.0,it is found mainly in the phase as .

What is the conjugate acid of NH₃?

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

Identify the compound with the highest pK_a.