Equilibria of Acids and Bases Answers
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1
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Which of these refers to the concentration of an acid?
A
a compound that accepts protonsB
an acid that does not dissociate completely when placed in waterC
an intrinsic characteristic of a particular acid related to its dissociation constantD
a measure of quantity of acid dissolved in water that is designated by molarity2
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What does it mean for a weak acid to be in equilibrium?
A
The acids only slightly dissociate and readily undergo reverse reaction.B
The position of equilibrium in weak acids lies more to the right than to the left.C
At equilibrium there is a small amount of HA and more and .
D
At equilibrium there is the same amount of HA, and .
3
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.4
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.5
Which equations shows the complete dissociation of a strong base?
A
mc012-1.jpg
B
mc012-2.jpg
C
mc012-3.jpg
D
mc012-4.jpg
6
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.7
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.8
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.9
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 .
A
1.3 10–21
B
7.7 10–15
C
1.3 10–14
D
7.7 10–8
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