Question 1

Explain the term "amphoteric." Use the hydrogen carbonate ion,HCO3- to illustrate amphoteric behavior.

Accepted Answer

An amphoteric compound or ion is one that can behave either as an acid or a base in solution,depending on the chemical environment.In reaction (1),it acts as an acid by donating a hydrogen ion.In reaction (2),it acts as a base by accepting the hydrogen ion.
(1) HCO₃^-(aq) + H₂O(l)

HCO⁺(aq) + CO₃^2-(aq)
(2) HCO₃^-(aq) + H₂O(l)

H₂CO₃(aq) + OH^-(aq)

Question 2

What is the concentration of a nitric acid solution if a 10.00 mL sample of the acid requires 31.25 mL of 0.135 M KOH for neutralization?

Accepted Answer

A) 0.422 M 
B) 0.0432 M 
C) 0.844 M 
D) 0.135 M 
E) 0.211 M 
A) 0.422 M 
B) 0.0432 M 
C) 0.844 M 
D) 0.135 M 
E) 0.211 M A

Question 3

Which of the following pH's corresponds to a weakly acidic solution?

Accepted Answer

A) 5.3 
B) 1.4 
C) 7.8 
D) 9.2 
E) 11.5 
A) 5.3 
B) 1.4 
C) 7.8 
D) 9.2 
E) 11.5 A

Question 4

What is the normality of a solution prepared by dissolving 75.0 g citric acid,a triprotic acid with molar mass of 192.14 g,in water to make 250.mL solution?

Accepted Answer

A) 0.173 N 
B) 0.0576 N 
C) 0.293 N 
D) 4.68 N 
E) 1.56 N 
A) 0.173 N 
B) 0.0576 N 
C) 0.293 N 
D) 4.68 N 
E) 1.56 N

Question 5

What is the concentration of an acetic acid solution if a 10.0 mL sample required 26.4 mL of 0.950 M KOH for neutralization?

Accepted Answer

A) 0.379 M 
B) 0.399 M 
C) 0.950 M 
D) 2.51 M 
E) 2.78 M 
A) 0.379 M 
B) 0.399 M 
C) 0.950 M 
D) 2.51 M 
E) 2.78 M

Question 6

Which of the following is a triprotic acid?

Accepted Answer

A) H3PO4 
B) CH3COOH 
C) HNO3 
D) NH3 
E) Al(OH)3 
A) H3PO4 
B) CH3COOH 
C) HNO3 
D) NH3 
E) Al(OH)3

Question 7

The normality of a solution prepared by dissolving 25.0 g of Ca(OH)2 in water to make 250.mL solution is ________ N.

Accepted Answer

A) 2.70 
B) 1.35 
C) 0.675 
D) 3.51 
E) 1.75 
A) 2.70 
B) 1.35 
C) 0.675 
D) 3.51 
E) 1.75

Question 8

What is the concentration of a weak base solution if a 25.0 mL sample is neutralized by 48.3 mL of 0.105 M H3PO4?

Accepted Answer

A) 0.0543 M 
B) 0.0676 M 
C) 0.163 M 
D) 0.203 M 
E) 0.609 M 
A) 0.0543 M 
B) 0.0676 M 
C) 0.163 M 
D) 0.203 M 
E) 0.609 M

Question 9

The normality of a solution prepared by dissolving 50.0 g of Ca(OH)2 in water to make 250.mL solution is ________ N.

Accepted Answer

A) 1.35 
B) 2.70 
C) 3.51 
D) 5.40 
E) 7.02 
A) 1.35 
B) 2.70 
C) 3.51 
D) 5.40 
E) 7.02

Question 10

Which example is not acidic?

Accepted Answer

A) orange juice 
B) soil for azaleas with pH of 4.8 
C) a solution of NH4NO3 with pH 3O+] = 1.00 × 10-7 
A) orange juice 
B) soil for azaleas with pH of 4.8 
C) a solution of NH4NO3 with pH 3O+] = 1.00 × 10-7

Question 11

Consider the following reaction: NO2- + HCO3-   
CO3-2 + HNO2
Identify the acid,base,conjugate acid and conjugate base.

Accepted Answer

Acid: HCO₃^-;Conjugate

Question 12

The base forms a new ________ bond in a Brønsted-Lowry acid-base reaction.

Accepted Answer

A) covalent 
B) aquo 
C) hydrogen 
D) ionic 
E) metallic 
A) covalent 
B) aquo 
C) hydrogen 
D) ionic 
E) metallic

Question 13

If the concentration of OH- in an aqueous solution is 1.4 × 10-7 M,the concentration of H3O+ is

Accepted Answer

A) 7.1 × 10+6 M. 
B) 1.0 × 10-7 M. 
C) 1.4 × 10-7 M. 
D) 7.1 × 10-8 M. 
E) 1.3 × 10-8 M. 
A) 7.1 × 10+6 M. 
B) 1.0 × 10-7 M. 
C) 1.4 × 10-7 M. 
D) 7.1 × 10-8 M. 
E) 1.3 × 10-8 M.

Question 14

Which compound has a value of Ka that is close to 10-5?

Accepted Answer

A) NaCl 
B) HNO3 
C) CH3CH2CO2H 
D) KOH 
E) NH3 
A) NaCl 
B) HNO3 
C) CH3CH2CO2H 
D) KOH 
E) NH3

Question 15

How many mL of 0.100 M NaOH are needed to neutralize 24.0 mL of 0.150 M HCl?

Accepted Answer

A) 12.0 mL 
B) 18.0 mL 
C) 24.0 mL 
D) 36.0 mL 
E) 48.0 mL 
A) 12.0 mL 
B) 18.0 mL 
C) 24.0 mL 
D) 36.0 mL 
E) 48.0 mL

Question 16

Match the following.
-Bronsted-Lowry theory

Accepted Answer

A) the species that results when a base accepts a proton 
B) an acid-base theory that bases reactions on hydrogen and hydroxide ions 
C) a theory that treats acid-base reactions as proton-transfer reactions 
D) a substance which can behave as either an acid or a base 
E) the species that results when an acid donates a proton 
A) the species that results when a base accepts a proton 
B) an acid-base theory that bases reactions on hydrogen and hydroxide ions 
C) a theory that treats acid-base reactions as proton-transfer reactions 
D) a substance which can behave as either an acid or a base 
E) the species that results when an acid donates a proton

Question 17

In the following equation,which of the following is acting as the Bronsted acid?
HClO4 + H2O → ClO4- + H3O+

Accepted Answer

A) HClO4 
B) H2O 
C) ClO4- 
D) H3O+ 
A) HClO4 
B) H2O 
C) ClO4- 
D) H3O+

Question 18

What is the pH of a solution in which [H3O+] = 3.8 × 10-8 M?

Accepted Answer

A) 7.42 
B) 6.58 
C) 3.80 
D) 1.0 × 10-8 
E) 2.6 × 10-7 
A) 7.42 
B) 6.58 
C) 3.80 
D) 1.0 × 10-8 
E) 2.6 × 10-7

Question 19

The H3O+ ion is called the ________ ion.

Accepted Answer

A) hydroxide 
B) hydronium 
C) hydrogen 
D) protium 
E) water 
A) hydroxide 
B) hydronium 
C) hydrogen 
D) protium 
E) water

Question 20

Write a balanced equation for the transfer of a proton between dihydrogen phosphate ion and the hydroxide ion.Identify the conjugate acid-base pairs and determine which side of the reaction is favored.

Accepted Answer

H₂PO₄^-(aq) + OH^-(aq) @#IMG-DLM& HPO₄^2-(aq) + H

Exam 10: Acids and Bases

Explain the term "amphoteric." Use the hydrogen carbonate ion,HCO3- to illustrate amphoteric behavior.

What is the concentration of a nitric acid solution if a 10.00 mL sample of the acid requires 31.25 mL of 0.135 M KOH for neutralization?

Which of the following pH's corresponds to a weakly acidic solution?

What is the normality of a solution prepared by dissolving 75.0 g citric acid,a triprotic acid with molar mass of 192.14 g,in water to make 250.mL solution?

What is the concentration of an acetic acid solution if a 10.0 mL sample required 26.4 mL of 0.950 M KOH for neutralization?

Which of the following is a triprotic acid?

The normality of a solution prepared by dissolving 25.0 g of Ca(OH)2 in water to make 250.mL solution is ________ N.

What is the concentration of a weak base solution if a 25.0 mL sample is neutralized by 48.3 mL of 0.105 M H3PO4?

The normality of a solution prepared by dissolving 50.0 g of Ca(OH)2 in water to make 250.mL solution is ________ N.

Which example is not acidic?

Consider the following reaction: NO2- + HCO3- CO3-2 + HNO2 Identify the acid,base,conjugate acid and conjugate base.

The base forms a new ________ bond in a Brønsted-Lowry acid-base reaction.

If the concentration of OH- in an aqueous solution is 1.4 × 10-7 M,the concentration of H3O+ is

Which compound has a value of Ka that is close to 10-5?

How many mL of 0.100 M NaOH are needed to neutralize 24.0 mL of 0.150 M HCl?

Match the following. -Bronsted-Lowry theory

In the following equation,which of the following is acting as the Bronsted acid? HClO4 + H2O → ClO4- + H3O+

What is the pH of a solution in which [H3O+] = 3.8 × 10-8 M?

The H3O+ ion is called the ________ ion.

Write a balanced equation for the transfer of a proton between dihydrogen phosphate ion and the hydroxide ion.Identify the conjugate acid-base pairs and determine which side of the reaction is favored.

Matter and Measurements

Atoms and the Periodic Table

Ionic Compounds

Molecular Compounds

Classification and Balancing of Chemical Reactions

Chemical Reactions: Mole and Mass Relationships

Chemical Reactions: Energy, rates, and Equilibrium

Gases, liquids, and Solids

Solutions

Nuclear Chemistry

Introduction to Organic Chemistry: Alkanes

Alkenes, alkynes, and Aromatic Compounds

Some Compounds With Oxygen, sulfur, or a Halogen

Aldehydes and Ketones

Amines

Carboxylic Acids and Their Derivatives

Amino Acids and Proteins

Enzymes and Vitamins

Carbohydrates

The Generation of Biochemical Energy

Carbohydrate Metabolism

Lipids

Lipid Metabolism

Protein and Amino Acid Metabolism

Nucleic Acids and Protein Synthesis

Genomics

Chemical Messengers: Hormones, neurotransmitters, and Drugs

Body Fluids

Filters

Explain the term "amphoteric." Use the hydrogen carbonate ion,HCO₃^- to illustrate amphoteric behavior.

The normality of a solution prepared by dissolving 25.0 g of Ca(OH)₂ in water to make 250.mL solution is ________ N.

What is the concentration of a weak base solution if a 25.0 mL sample is neutralized by 48.3 mL of 0.105 M H₃PO₄?

The normality of a solution prepared by dissolving 50.0 g of Ca(OH)₂ in water to make 250.mL solution is ________ N.

Consider the following reaction: NO₂^-+ HCO₃^- CO₃^-2+ HNO₂ Identify the acid,base,conjugate acid and conjugate base.

If the concentration of OH^- in an aqueous solution is 1.4 × 10^-7 M,the concentration of H₃O⁺ is

Which compound has a value of K_a that is close to 10^-5?

In the following equation,which of the following is acting as the Bronsted acid? HClO₄ + H₂O → ClO₄^- + H₃O⁺

What is the pH of a solution in which [H₃O⁺] = 3.8 × 10^-8 M?

The H₃O⁺ ion is called the ________ ion.