AnswersTX-Chemistry B-CRLab: Measuring pH

Lab: Measuring pH — Unit test Answers

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21
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A substance with a high [H+ ] would likely have which additional characteristics?

A
a high [OH– ] and a high pOH
B
a low [OH– ] and a high pOH
C
a high [OH– ] and a low pOH
D
a low [OH– ] and a low pOH
22
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What is the Bronsted-Lowry definition of a base?

A
a compound that donates protons
B
a compound that accepts protons
C
a substance that increases hydroxide ion concentration
D
a substance that increases hydronium ion concentration
23

The pH of a solution is 2.0. Which statement is correct?Useful formulas include , , , and .

Question illustration
A
The pOH of the solution is 12.0.
B
The concentration of OH– ions is 1.0 10–2 M.
Option B
C
The concentration of ions is 100.0 M.
Option C
D
The pOH of the solution is 16.0.
24

Which best describes the definition of Lewis acids and bases?

A
a general definition based on electron structure
B
a general definition based on hydrogen ion concentration
C
a specific definition based on a compound’s ability to accept protons
D
a specific definition based on a compound’s ability to donate protons
25

Which statement correctly describes the Ka of a weak acid?

A
The Ka is large, and the equilibrium favors products.
B
The Ka is large, and the equilibrium favors reactants.
C
The Ka is small, and the equilibrium favors products.
D
The Ka is small, and the equilibrium favors reactants.
26

Consider the reaction below.HF + H2O H3O + FWhich is an acid-conjugate base pair?

Question illustration
A
HF and H3O+
B
HF and F
Option B
C
H2O and HF
D
H2O and F
Option D
27

Which statement is correct?

A
Salts are formed by the reaction of bases with water.
B
Most salts are ionic and are soluble in water.
C
Most salts are insoluble in water and lack electrical charges.
D
Solutions of salt and water do not conduct electricity.
28

How does the value of and compare with the concentrations of hydronium ion and hydroxide ion?

Question illustration
A
mc019-3.jpg
Option A
B
mc019-4.jpg
Option B
C
mc019-5.jpg
Option C
D
mc019-6.jpg
Option D
29

What is the pH of a solution with [H+] = 1.25 10–10 M?Use .

Question illustration
A
–10.1
B
–9.90
C
7.90
D
9.90
30

A base is added to water. What happens when the position of equilibrium lies to the left?

A
The base is completely dissociating into products.
B
The base is partially dissociating into products.
C
The base is not dissociating into any ions.
D
The base is present in very small amounts.
31

When does phenolphthalein turn pink?

A
in the presence of a base
B
in the presence of an acid
C
when it is in a neutral solution
D
when it is reacting with a metal
32

Which statement best relates the strength and concentration of a base?

A
At high enough concentrations, a weak base becomes strong.
B
Even at low concentrations, a strong base is strong.
C
A weak base always has a low concentration.
D
The stronger the base, the higher its concentration.
33

What is the net ionic equation for the reaction that is represented by the following total ionic equation?

Question illustration
A
2 upper N a subscript 3 upper P upper O subscript 4 plus 3 upper C a upper C l subscript 2 right arrow 6 upper N a upper C l plus upper C a subscript 3 (upper P upper O subscript 4) subscript 2.
Option A
B
2 upper P upper O subscript 4 superscript 3 minus, plus 3 upper C a superscript 2 plus right arrow upper C a subscript 3 (upper P upper O subscript 4) subscript 2.
Option B
C
2 upper P upper O subscript 4 superscript 3 minus, plus 3 upper C a superscript 2 plus, plus 6 upper C l superscript minus right arrow 6 upper N a superscript plus, upper C a subscript 3 (upper P upper O subscript 4) subscript 2.
Option C
D
2 upper P superscript 5 plus, plus 8 upper O superscript 2 minus, plus 3 upper C a superscript 2 plus right arrow upper C a subscript 3 (upper P upper O subscript 4) subscript 2.
Option D
34

What is the Arrhenius definition of an acid?

A
A substance that increases H3O+ concentration when it is dissolved in water.
B
A substance that increases OH– concentration when it is dissolved in water.
C
A compound that donates protons.
D
A compound that accepts protons.
35

The main active components of bleach and many other household cleaners are

A
salts.
B
neutral.
C
acids.
D
bases.

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Lab: Measuring pH