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Acid-Base (1797461)
Question
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Instructions
You will only have two tries for multiple choice questions, four for the rest. Careful
when converting concentration to pH. Significant figures are indicated after the
decimal place.
1.
Question Details
GBEssGOB1 9.AE.028. [1230956]
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GBEssGOB1 9.AE.036. [1230951]
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Write the structure of the conjugate base of the following acids.
(a) CH3CH2COOH
CH3CH2COO- -or- CH3CH2CO2-
(b) HCN
CN-
(c) H3O+
H 2O
2.
Question Details
For each of the following chemical equations, indicate whether the equation represents the dissociation of a strong acid,
strong base, weak acid, or weak base.
(a) Ca(OH)2 + H2O
→ Ca2+ + 2 OH-
strong acid
strong base
weak acid
weak base
(b) HCOO- + H2O
HCOOH + OH-
strong acid
strong base
weak acid
weak base
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3.
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GBEssGOB1 9.AE.040. [1230974]
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Butanoic acid has an acrid taste and an unpleasant odor. It is found in rancid butter and Parmesan cheese. In aqueous
solution, butanoic acid undergoes the following reversible reaction:
(a) What substances are present at equilibrium? (Select all that apply.)
water
butanoate ion
hydronium ion
butanoic acid
(b) Is the concentration of butanoic acid and butanoate ion constant or changing at equilibrium?
The concentration of butanoic acid is changing, but the concentration of butanoate ion is constant.
The concentration of both butanoic acid and butanoate ion is changing.
The concentration of butanoic acid is constant, but the concentration of butanoate ion is changing.
The concentration of both butanoic acid and butanoate ion is constant.
(c) What is the significance of the two opposing arrows in this equation?
The two opposing arrows indicate that both the forward and reverse reactions occur simultaneously.
The two opposing arrows indicate that the forward and reverse reactions cancel each other out.
The two opposing arrows indicate that we do not know which direction the reaction will occur in.
4.
Question Details
GBEssGOB1 9.AE.046. [1230959]
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7/25/2011 3:16 PM
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In the blood the following reaction plays an important role:
H2CO3 + H2O
H3O+ + HCO3-
(a) Identify two ways to shift the reaction to the right.
add more carbonic acid
remove some carbonic acid
add more hydronium ion
remove some water
remove some hydronium ion
add more bicarbonate ion
(b) Identify two ways to shift the reaction to the left.
add more hydronium ion
add some water
remove some hydronium ion
add more bicarbonate ion
remove some bicarbonate ion
add more carbonic acid
5.
Question Details
GBEssGOB1 9.AE.048. [1230955]
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Write the balanced equation for the reaction of HCN with the following compounds. (Use the lowest possible coefficients.
Omit states-of-matter from your answer.)
(a) KOH
HCN + KOH → H2O + KCN
(b) Al(OH)3
3 HCN + Al(OH)3 → 3 H2O + Al(CN)3
(c) Mg(OH)2
2 HCN + Mg(OH)2 → 2 H2O + Mg(CN)2
6.
Question Details
GBEssGOB1 9.AE.060. [1230918]
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7/25/2011 3:16 PM
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What is the pH of a blood sample that has an [H3O+ ] = 3.63
10-8?
7.440
Calculate the [OH ⎯ ] as well.
2.75e-07 M
Is the pH of this blood sample within the normal range?
Yes
No
7.
Question Details
GBEssGOB1 9.AE.068. [1230954]
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A patient has severe diarrhea, which results in an excessive loss of sodium bicarbonate from the body. How is the pH of the
patient's blood affected by this loss?
pH rises
pH drops
What component of the bicarbonate/carbonic acid buffer should be given to the patient to regulate the pH in the blood?
bicarbonate
carbonic acid
8.
Question Details
GBEssGOB1 9.AE.062. [1230943]
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GBEssGOB1 9.TB.023. [1232015]
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GBEssGOB1 9.TB.014. [1232027]
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Which of the following represents a buffer?
(a) HCl and HNO3
a buffer
not a buffer
(b) Na2CO3 and HCl
a buffer
not a buffer
(c) Na2HPO4 and NaH2PO4
a buffer
not a buffer
9.
Question Details
When an acid is dissolved in water, it reacts to give _________ and ________.
(a)
hydroxide; the conjugate acid
(b)
hydronium; the conjugate acid
(c)
hydroxide; the conjugate base
(d)
(e)
10.
Question Details
hydronium; the conjugate base
hydroxide; hydronium
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Which of the following types of molecules and ions is least likely to act as a base?
(a)
An anion
A cation
(b)
11.
(c)
A neutral molecule containing a nonbonding pair of electrons
(d)
A tertiary nitrogen
(e)
All of these are likely to act as bases.
Question Details
GBEssGOB1 9.TB.099. [1232073]
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GBEssGOB1 9.TB.102. [1232040]
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Which of the following buffer systems is the primary buffering system in the blood?
12.
(a)
H2CO3/HCO3⎯
(b)
CH3COOH/CH3COO⎯
(c)
Proteins
(d)
DNA and RNA
(e)
H2PO4⎯/HPO42-
Question Details
Which of the following changes in blood pH would you expect to observe in a hyperventilating patient, and what are those
changes called?
(a)
A drop in pH, alkalosis
(b)
A drop in pH, acidosis
(c)
An increase in pH, alkalosis
(d)
An increase in pH, acidosis
(e)
There will not be any change in blood pH.
Assignment Details
7/25/2011 3:16 PM