AnswersCrowley Original Credit Chemistry BEquilibria of Acids and Bases

Equilibria of Acids and Bases Answers

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1
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Which of these accurately describes why an acid is strong?

A
An acid is strong when it undergoes a reverse reaction.
B
An acid becomes strong when it is mixed with a base.
C
An acid’s strength is due to the amount present in a solution.
D
An acid is strong when it dissociates completely in water.
2
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Which is true of weak acids and bases?

A
They partially dissociate in water.
B
They dissociate completely in water.
C
They are unable to react with water.
D
They lose all their properties when in water.
3

Look at the table of dissociation constants for some acids.Acid KaAcetic acidChlorous acidNitrous acidPropionic acidWhich of these is the strongest acid?

Question illustration
A
acetic acid
B
chlorous acid
C
nitrous acid
D
propionic acid
4

Which equations shows the complete dissociation of a strong base?

A
mc012-1.jpg
Option A
B
mc012-2.jpg
Option B
C
mc012-3.jpg
Option C
D
mc012-4.jpg
Option D
5

If hydrofluoric acid is a stronger acid than acetic acid, which statement is most likely true?

A
The conjugate acid of hydrofluoric acid is weaker than that of acetic acid.
B
The conjugate acid of hydrofluoric acid is stronger than that of acetic acid.
C
The conjugate base of hydrofluoric acid is weaker than that of acetic acid.
D
The conjugate base of hydrofluoric acid is stronger than that of acetic acid.
6

The Ka of an acid is 1.3 10–7. Based on the Ka and its relationship with Kw, what is the value of Kb?Use .

Question illustration
A
1.3 10–21
Option A
B
7.7 10–15
Option B
C
1.3 10–14
Option C
D
7.7 10–8
Option D
7

What does it mean for a strong acid to be in equilibrium?

A
The equilibrium lies far to the right so that products are very heavily favored.
B
The equilibrium lies far to the left so that reactants are heavily favored.
C
At equilibrium the products and the reactants are in equal balance.
D
At equilibrium there are a lot of strong acids and very few ions.
8

Which of these refers to the concentration of an acid?

A
a compound that accepts protons
B
an acid that does not dissociate completely when placed in water
C
an intrinsic characteristic of a particular acid related to its dissociation constant
D
a measure of quantity of acid dissolved in water that is designated by molarity
9

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.
10

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.

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