Deck 9: Acid-Base Reactions

Question 1

What is the pH of a 0.001 M HCl solution?

A) 10^-3
B) 0.001
C) 3
D) -3

Answer 1

3

Question 2

Carbonic acid, H₂CO₃(aq) is present in

A) eye drops
B) milk
C) carbonated beverages
D) vinegar

Answer 2

carbonated beverages

Question 3

Which of the following indicates a basic solution?

A) pH = 7
B) pH < 7
C) pH = 11
D) pH = 0

Answer 3

pH = 11

Question 4

Which is a basic or alkaline substance?

A) gastric fluid
B) black coffee
C) vitamin C
D) oven cleaner

Question 5

A solution with pH = 4 has

A) relatively high concentration of OH^-
B) relatively low concentration of H₃O⁺
C) zero concentration of OH^-
D) relatively high concentration of H₃O⁺

Question 6

Which one of the following is the acid in vinegar?

A) acetic acid
B) citric acid
C) muriatic acid
D) ascorbic acid

Question 7

A buffer is a mixture that

A) maintains pH
B) causes a solution not to conduct electricity
C) neutralize salts
D) causes high blood pressure

Question 8

In an acidic solution,

A) [H₃O⁺] is greater than [OH^-]
B) [H₃O⁺] equals [OH^-]
C) [OH^-] is greater than [H₃O⁺]
D) none of these

Question 9

Which common substance would have a pH less than 7?

A) milk of magnesia
B) wine
C) borax solution
D) bleach

Question 10

An ion commonly found in many antacids is

A) OH^-
B) H₃O⁺
C) SO₄^2-
D) NH₄⁺

Question 11

Which is an acidic substance?

A) household ammonia
B) soap
C) aspirin
D) oven cleaner

Question 12

The strength of an acid is related to its

A) extent of ionization
B) reaction with a salt
C) concentration
D) commercial ranking in the economy

Question 13

What is the pH of a 0.0001 M HCl solution?

A) 10^-4
B) 0.0001
C) -4
D) 4

Question 14

Which equation represents a neutralization reaction?

A) KCl + H₂O $\rightarrow$ K⁺(aq) + Cl^- (aq)
B) H⁺(aq) + OH^- (aq) $\rightarrow$ H₂O
C) HCl + H₂O $\rightarrow$ H₃O⁺(aq) + Cl^-(aq)
D) NaOH + H₂O $\rightarrow$ Na⁺(aq) + OH^- (aq)

Question 15

Which equation represents the neutralization of acidic gastric fluid?

A) 2 HNO₃(aq) + Mg(OH)₂ (aq) $\rightarrow$ Mg(NO₃)₂(aq) + 2 H₂O
B) H⁺(aq) + OH⁺(aq) $\rightarrow$ H₂O
C) 2 HCl(aq) + Mg(OH)₂ (aq) $\rightarrow$ 2 H₂O + MgCl₂(aq)
D) NaOH + H₂O $\rightarrow$ Na⁺(aq) + OH^- (aq)

Question 16

Which of the following is associated with stomach fluid?

A) HNO₃
B) H₃PO₄
C) HCl
D) H₃PO₄ and HCl

Question 17

Which reactant substance is the base, in the following reaction, NH₃(g) + H₂O( l) $\rightarrow$ NH₄⁺(aq) + OH^-(aq) ?

A) OH^-
B) NH₄⁺
C) H₂O
D) NH₃

Question 18

What is the salt formed when an HCl solution reacts with Mg(OH)₂?

A) MgCl₂
B) Mg₂Cl
C) MgCl
D) Mg₂Cl₂

Question 19

Which of the following is a property of bases?

A) feel slippery to the touch
B) have pH below 7
C) turn blue litmus red
D) neutralize substances like NaOH

Question 20

What volume (in liters) of 1 M NaOH contains 40 g sodium hydroxide?

A) 100 L
B) 1 L
C) 10 L
D) 1000 L

Question 21

A base is

A) an OH^- ion donor
B) a hydrogen ion donor
C) a substance like magnesium hydroxide, Mg(OH)₂
D) both a and c

Question 22

H₃O⁺ is the

A) hydronium ion
B) hydrogen ion
C) proton
D) hydridium ion

Question 23

Hydrogen chloride gas has polar covalent molecules.An aqueous solution of HCl conducts electricity.How?

A) HCl ionizes in water
B) HCl molecules carry electrons from one electrode to the other electrode
C) water molecules carry electrons from one electrode to the other electrode
D) HCl molecules and water molecules carry the current

Question 24

The substance Ca(OH)₂ is

A) an acid
B) a hydrate
C) a base
D) an oxide

Question 25

What acid is found in stomach fluid?

A) sulfuric acid, H₂SO₄
B) hydrochloric acid, HCl
C) citric acid, HOC(COOH)(CH₂COOH)₂
D) acetic acid, CH₃COOH

Question 26

What is the pH for a solution with hydrogen ion molarity of 0.01?

A) -2
B) 2
C) 100
D) 10^-2

Question 27

All aqueous solutions of electrolytes must by definition

A) be acids
B) be neutral
C) contain no ions
D) conduct electricity

Question 28

Chemical buffering systems

A) maintain constant pH
B) consist of a conjugate acid-base pair
C) absorb added H⁺ or OH^- ions
D) do all of the above

Question 29

The formula of a salt formed from Ca²⁺ and PO₄^3- ions is

A) CaPO₄
B) Ca₂(PO₄)₃
C) Ca₃(PO₄)₂
D) Ca₃P₂O₄

Question 30

Why is pure water neutral?

A) pure water has no H⁺ ions and no OH^- ions
B) pure water has equal numbers of H⁺ ions and OH^- ions
C) pure water has no dissolved carbon dioxide
D) the pH of pure water at 25 $\degree$ is 0

Question 31

Which of the following is a property of acids?

A) turn red litmus blue
B) have pH below 7
C) feel slippery to the touch
D) neutralize acids

Question 32

If 3 moles of a substance are dissolved in 500 mL (0.5 L) of solution, the molarity of this solution is

A) 3 M
B) 1.5 M
C) 3.5 M
D) 6 M

Question 33

What carries the electrical current in an aqueous NaCl solution?

A) electrons
B) ions
C) the solvent - water
D) none of the above

Question 34

An acid ion pair such as H₂CO₃ and HCO₃^- qualifies as a

A) strong acid-strong base pair
B) buffer system
C) substitute for hemoglobin
D) acid -base pair

Question 35

Red cabbage can be used as a dye indicator used to measure pH, in basic solutions it has a color.

A) pink
B) yellow
C) red
D) colorless

Question 36

How many mols of phosphoric acid, H₃PO₄ are in 0.50 liters of 6 M H₃PO₄(aq)?

A) 6.5
B) 24
C) 12
D) 3

Question 37

How many mols of sulfuric acid, H₂SO₄(aq) are in 2 liters of 18 M H₂SO₄?

A) 9
B) 20
C) 36
D) 98

Question 38

What substance is found in corrosive cleaners?

A) sulfuric acid, H₂SO₄
B) hydrochloric acid, HCl
C) sodium hydroxide, NaOH
D) acetic acid, CH₃COOH

Question 39

Which is the weak acid?

A) HCl
B) H₂SO₄
C) HNO₃
D) HC₂H₃O₂

Question 40

The symbol, M, related to concentration of solution, refers to

A) much meaning a very concentrated solution
B) molal concentration
C) moles of solute dissolved in a liter of solution
D) mixed meaning the solution has been stirred well

Question 41

What is the pH of a solution with a [H₃O⁺] = 1.0 * 10^-10?

A) 10^-10
B) 1.0
C) -10
D) 10

Question 42

Which of the following is true about a solution with pH = 8?

A) the solution is basic
B) the H⁺ concentration equals 0.00000001 M
C) the OH^- concentration > H⁺ concentration
D) all of these

Question 43

What is the concentration difference between pH = 10 and pH = 7?

A) 100
B) 0.001
C) 3
D) 1000

Question 44

What is the pH of a 0.0525 M HCl solution?

A) 5.25
B) 0.0525
C) 1.28
D) 3.00

Question 45

OH- is the

A) hydroxide ion
B) hydrogen ion
C) oxygen hydride
D) hydronium ion

Question 46

How many acidic hydrogen atoms are in the molecule of acetic acid, CH3COOH?

A) one
B) two
C) three
D) four

Question 47

When H₂SO₃ dissolves in water, what are the solute particles in the solution?

A) H, S, O
B) H¹⁺, S¹⁺ and O^2-
C) H¹⁺, HSO₃^- and SO₃^2-
D) H₂¹⁺ and SO₃^2-

Question 48

What is the pH of a 0.00125 M NaOH solution?

A) 2.90
B) 11.1
C) 12.5
D) 1.25

Question 49

Which of the following is true about a solution with pH = 5?

A) the solution is basic
B) the OH- concentration > H⁺ concentration
C) the solution is acidic
D) both a and b

Question 50

Identify the acid in the following reaction, NH₃(g) + H₂O( l) $\rightarrow$ NH₄⁺(aq) + OH^-(aq)?

A) OH^-
B) NH₄⁺
C) H₂O
D) NH₃

Question 51

Which of the following is a strong base?

A) NH₃
B) NaOH
C) KOH
D) both b and c

Question 52

Which pair would make a good buffer?

A) H⁺/OH^-
B) Na⁺ /Cl^-
C) HPO₄^2- /PO₄^3-
D) Na⁺ /OH^-

Question 53

What is the hydronium concentration with pH = 9.5?

A) 3.16 * 10^-10
B) 9.50*10^-10
C) 9.15
D) 3.16 * 10¹⁰

Question 54

What is the molarity of a solution when 15.0 g of NaCl is dissolved to a final volume of 500 mL with water?

A) 0.153 M
B) 117 M
C) 0.0300 M
D) 30.0 M