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Acid-Base (1240021)
Question 123456789101112
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 DetailsGBEssGOB1 9.AE.028. [1230956]
Write the structure of the conjugate base of the following acids.
(a) CH3CH2COOH
CH3CH2COO- -or- CH3CH2CO2-
(b) HCl
Cl-
(c) NH4+
NH3
Question DetailsGBEssGOB1 9.AE.036. [1230951]
2.
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
Question DetailsGBEssGOB1 9.AE.040. [1230974]
3.
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.)
butanoic acid
hydronium ion
butanoate ion
water
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(b) Is the concentration of butanoic acid and butanoate ion constant or changing at equilibrium?
The concentration of both butanoic acid and butanoate ion is constant.
The concentration of butanoic acid is changing, but the concentration of butanoate ion is constant.
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 changing.
(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 DetailsGBEssGOB1 9.AE.046. [1230959]
In the blood the following reaction plays an important role:
H2CO 3 + H2O
H3O + + HCO3(a) Identify two ways to shift the reaction to the right.
add more hydronium ion
add more carbonic acid
add more bicarbonate ion
remove some carbonic acid
remove some hydronium ion
remove some water
(b) Identify two ways to shift the reaction to the left.
add more hydronium ion
add more carbonic acid
remove some hydronium ion
add more bicarbonate ion
remove some bicarbonate ion
add some water
Question DetailsGBEssGOB1 9.AE.048. [1230955]
5.
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) Sr(OH)2
2 HCN + Sr(OH)2 → 2 H2O + Sr(CN)2
6.
Question DetailsGBEssGOB1 9.AE.060. [1230918]
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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 DetailsGBEssGOB1 9.AE.068. [1230954]
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?
carbonic acid
bicarbonate
8.
Question DetailsGBEssGOB1 9.AE.062. [1230943]
Which of the following represents a buffer?
(a) CH3CH2COOH (propanoic acid, a weak acid) and CH3CH2COONa
a buffer
not a buffer
(b) HCl and sodium citrate
a buffer
not a buffer
(c) Na2HPO4 and NaH2PO4
a buffer
not a buffer
Question DetailsGBEssGOB1 9.TB.023. [1232015]
9.
When an acid is dissolved in water, it reacts to give _________ and ________.
(a)
hydronium; the conjugate base
(b)
hydronium; the conjugate acid
(c)
hydroxide; hydronium
(d)
hydroxide; the conjugate acid
(e)
hydroxide; the conjugate base
10.
Question DetailsGBEssGOB1 9.TB.014. [1232027]
Which of the following types of molecules and ions is least likely to act as a base?
(a)
(b)
An anion
A cation
(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 DetailsGBEssGOB1 9.TB.099. [1232073]
11.
Which of the following buffer systems is the primary buffering system in the blood?
(a)
DNA and RNA
(b)
Proteins
(c)
CH3COOH/CH3COO⎯
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(d)
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H2PO4⎯/HPO42-
(e)
H2CO 3/HCO3⎯
12.
Question DetailsGBEssGOB1 9.TB.102. [1232040]
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
An increase in pH, alkalosis
(c)
(d)
An increase in pH, acidosis
(e)
There will not be any change in blood pH.
Assignment Details
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