Question 1

Which of the following buffers will have the lowest pH?

Accepted Answer

A)  a solution containing 0.10 M HC2H3O2 and 0.10 M NaC2H3O2 
B)  a solution containing 0.20 M HC2H3O2 and 0.20 M NaC2H3O2 
C)  a solution containing 0.30 M HC2H3O2 and 0.30 M NaC2H3O2 
D)  They all have the same pH.

Question 2

Which of the following pH's corresponds to a highly basic solution?

Accepted Answer

A)  2.8 
B)  6.8 
C)  7.2 
D)  11.2

Question 3

Which of the following is characteristic of a buffer?

Accepted Answer

A)  The pH will go down significantly when OH- is added to the buffer. 
B)  The pH will go down very slightly when OH- is added to the buffer. 
C)  The pH will go up significantly when OH- is added to the buffer. 
D)  The pH will go up very slightly when OH- is added to the buffer.

Question 4

Which of the following is not true of pH indicators?

Accepted Answer

A)  They all change color at pH = 7. 
B)  They all have different colors in acid solutions than in basic solutions. 
C)  They can be papers which have been soaked in specific compounds. 
D)  None of the above, all the statements are true.

Question 5

If phenolphthalein is used as an indicator which of the following will be observed if excess sodium hydroxide is added to acetic acid?

Accepted Answer

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

Question 6

Which of the following can be characterized as a strong base?

Accepted Answer

A)  0.001 M KOH 
B)  3.0 M KOH 
C)  both a and b 
D)  neither a nor b

Question 7

Which base is an important starting material in the manufacture of fertilizers?

Accepted Answer

A)  LiOH 
B)  Mg(OH)2 
C)  NaOH 
D)  NH3

Question 8

Which of the following is found in baking powder but not in baking soda?

Accepted Answer

A)  NaHCO3(s) 
B)  KH2PO4(s) 
C)  both a and b 
D)  neither a nor b

Question 9

Ammonia , NH3, is a stronger base than the acetate ion, CH3COO-. When acetic acid, CH3COOH, reacts with ammonia, NH3, what species are present in the solution in the largest amount?

Accepted Answer

A)  acetic acid, CH3COOH, and ammonia, NH3 
B)  acetic acid, CH3COOH, and ammonium, NH4+ 
C)  acetate ion, CH3COO-, and ammonia, NH3 
D)  acetate ion, CH3COO-, and ammonium ion, NH4+

Question 10

How many protons can be lost by acetic acid, CH3COOH?

Accepted Answer

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

Question 11

A solution has a pOH of 5.4. What is its pH?

Accepted Answer

A)  -8.6 
B)  -5.4 
C)  5.4 
D)  8.6

Question 12

Which of the following acids is the acid found in gastric fluid?

Accepted Answer

A)  acetic 
B)  hydrochloric 
C)  nitric 
D)  sulfuric

Question 13

Which of the following acids has long been used as a test for proteins?

Accepted Answer

A)  acetic 
B)  boric 
C)  nitric 
D)  sulfuric

Question 14

Which of the following is the conjugate acid of PO43-?

Accepted Answer

A)  H3PO4 
B)  H2PO4- 
C)  HPO42- 
D)  H3O+

Question 15

Which of the following is a cause of respiratory acidosis?

Accepted Answer

A)  a poor diet 
B)  hyperventilation 
C)  hypoventilation 
D)  intense exercise

Question 16

In an aqueous solution the [OH-] is 2.0 × 10-6 M. What is the [H+]?

Accepted Answer

A)  5.0 × 10-9 M 
B)  1.0 × 10-7 M 
C)  2.0 × 10-6 M 
D)  1.0 × 108 M

Question 17

Which of the following statements best describes the acid/base relationship?

Accepted Answer

A)  As acid strengths increase conjugate base strengths increase. 
B)  As base strengths increase conjugate acid strengths increase. 
C)  both a and b 
D)  neither a nor b

Question 18

Which of the following acids has the strongest conjugate base?

Accepted Answer

A)  CH3COOH 
B)  C6H5OH 
C)  H2SO4 
D)  H3PO4

Question 19

Which of the following occurs when hydrogen chloride gas is dissolved in water to form hydrochloric acid?

Accepted Answer

A)  A complex between HCl and water is formed. 
B)  H+ is transferred from HCl to water. 
C)  H+ is transferred from water to HCl. 
D)  There is no reaction, HCl molecules remain present.

Question 20

Which piece of glassware do we use to deliver a variable but precisely known volume of solution during a titration?

Accepted Answer

A)  a buret 
B)  an Erlenmeyer flask 
C)  a graduated cylinder 
D)  a volumetric pipet

Exam 8: Acids and Bases