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Acids, Bases and Buffers MCQ Flashcards | Quizlet
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Acids, Bases and Buffers MCQ
Terms in this set (56)
Which of the following
B
statements is CORRECT?
A. An acid is an electron
donor and a base is an
electron acceptor.
B. An acidic solution has a pH
less than 7 and a basic
solution has a pH greater
than 7.
C. Neutralization of a strong
acid by a strong base gives
only water.
D. The pH of saliva is normally
in the range of 8.5-9.5
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Which statement about
Acids, Bases and Buffers MCQ Flashcards | Quizlet
C
buffers below is most
correct?
A. A buffer is any acid and
base which together control
the concentration of
pH in the blood.
B. A buffer is the solution
which allows CO2 to be lost
from the lungs in order
to control the pH of the
lungs.
C. A buffer is a weak base and
its acid salt or a weak acid
and its basic salt. The
ratio of the two components
helps maintain blood pH
levels.
D. A buffer is a mixture of two
acids which together help to
maintain blood pH
Which of the following
B
statements is FALSE?
A. An acid is a proton donor
and a base is a proton
acceptor.
B. An acidic solution has a pH
greater than 7 and a basic
solution has a pH less
than 7.
C. Neutralization of an acid
by a base gives a solution of
salt in water.
D. The pH of the stomach is
normally in the range of 1.6-1.8
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Neutralization of an acid by a
Acids, Bases and Buffers MCQ Flashcards | Quizlet
B
base can be represented by
the following
equation:
H3 O+ + OH→ 2H2O
This means that the pH of the
solution after the
neutralization is
approximately:
A. 6
B. 7
C. 8
D. 9
A buffer solution consisting of
C
citric acid and citrate in a ratio
of 5:1 maintains
the pH at 7.4. What would be
the ratio of the two
components if the pH were to
become 6.4
A. 6:1
B. 10:1
C. 50:1
D. 1:10
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Which of the following
Acids, Bases and Buffers MCQ Flashcards | Quizlet
D
statements is closest to a
correct definition of an acid?
A. a substance that ionises in
a solution to produce
hydronium and hydroxide
ions.
B. a substance that reacts with
water to produce hydroxide
ions.
C. a substance that
dissociates in water to
produce a solution with pH
greater
than 7.0.
D. a substance that reacts
partly with water to produce
a low concentration of
hydronium ions.
The pH of a buffered solution
A
depends on:
A. the ratio of the
components of the buffer
solution.
B. the amount of acid added
to the buffer solution.
C. the amount of base added
to the buffer solution.
D. the amount of acid and of
base added to the solution
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The long term acid-base
Acids, Bases and Buffers MCQ Flashcards | Quizlet
B
balance in the body is
controlled by
A. the phosphate and
carbonic acid/bicarbonate
buffers in the blood
B. the kidneys and the lungs
C. the phosphate, carbonic
acid/bicarbonate, and protein
buffers in the blood
and cells.
D. the kidneys
You have a bottle of a strong
A
acid and you add 100 ml of
this to one litre of
water. What would the pH of
this final solution most likely
be?
A. pH=1
B. pH=5
C. pH=7
D. pH=11
What is the approximate
A
range of pH of gastric juice in
the stomach?
A. 1.6-1.8
B. 6.2-7.4
4.5 Acids, Bases and Buffers
82
C. 7.3-7.5
D. 7.8-8.6
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A buffer solution consisting of
Acids, Bases and Buffers MCQ Flashcards | Quizlet
A
acetic acid and acetate ions
(base) in a ratio of
acid to base of 1:20 maintains
the pH at 7.4. What is the ratio
of the two components
if the pH were to become 8.4
after addition of more of the
basic
component.
A. 1:200
B. 1:21
C. 1:30
D. 1:40
Acidity is stated as a pH value.
D
If the pH of urine sample "A" is
6 and the pH
of urine sample "B" is 7, then
which of the following is true?
A. the most acidic sample is
sample B.
B. sample A has 10 times the
hydroxide ion concentration
of sample B.
C. the B sample has 10 times
the hydrogen ion
concentration of sample A.
D. sample A has 10 times the
hydrogen ion concentration
of sample B
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One form of acid base
Acids, Bases and Buffers MCQ Flashcards | Quizlet
A
imbalance in the body is
called acidosis. In this
situation,
which of the following is true?
A. the blood is less alkaline
than it should be.
B. the blood's pH is less than
7.0
C. the blood is less acidic
than it should be.
D. the concentration of
hydrogen ions in the blood is
less than it should be.
One of the buffer systems in
B
the blood is the carbonic
acid/bicarbonate buffer.
It helps to maintain the body's
acid-base balance by
destroying any excess:
A. hydrogen ions in the
blood.
B. acid or base in the blood.
C. hydroxide ions formed in
the blood.
D. bicarbonate ions formed in
the blood.
The major buffer system in the
B
extracellular compartment is
the:
A. the protein buffer
B. carbonic acid/bicarbonate
buffer
C. ammonia buffer
D. phosphate buffer
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If a patient was suffering from
Acids, Bases and Buffers MCQ Flashcards | Quizlet
A
"acidosis", what would this
mean?
A. blood pH is not sufficiently
alkaline.
B. blood pH is acidic.
C. there is too little hydronium
ion in the plasma.
D. blood pH is too acidic.
What happens when an acid
C
is added to a buffered
solution?
A. the solution becomes
acidic
B. the pH of the solution
decreases significantly
C. the pH of the solution
decreases very slightly
D. the pH of the solution
increases slightly
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Which of the statements
Acids, Bases and Buffers MCQ Flashcards | Quizlet
C
below is correct?
A. The dihydrogen phosphate
component of the phosphate
buffer releases
hydrogen ions into the lungs
for excretion, and in the
process, reverts to
monohydrogen phosphate.
B. Haemoglobin as it passes
through the lungs, releases
hydronium ions,
which are breathed out.
C. Carbon dioxide that is
dissolved in blood diffuses
into the alveoli and is
breathed out.
D. Hydronium ions react with
bicarbonate ions to form
carbonic acid which
moves into the lungs for
exhalation
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9/29
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When aspirin (an acid) is in
Acids, Bases and Buffers MCQ Flashcards | Quizlet
A
the stomach (an acidic
environment), what may be
said of the aspirin molecules?
A. Most molecules will be unionised and therefore able to
be pass through the
stomach mucosa.
B. Most molecules will be
ionised and therefore able to
be pass through the
stomach mucosa.
C. Most molecules will be unionised and therefore NOT
able to be pass
through the stomach mucosa.
D. Aspirin will be in the form
of its salt and therefore able
to be pass through
the stomach mucosa.
Which statement below best
C
describes an acid solution?
The pH is less than:
A. 5
B. 6
C. 7
D. 8
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If a patient has blood pH that
Acids, Bases and Buffers MCQ Flashcards | Quizlet
C
is 7.3 (which is below the
healthy range of blood
pH values), which of the
following is a correct
statement?
A. the patient has alkalosis
B. the patient has excessive
alkali
C. the patient has acidosis
D. the patient has insufficient
acid
Which of the following
D
mechanisms results in acid
being excreted from the
body?
A. breathing out H2PO4
(dihydrogen-phosphate) from
the lungs
B. excreting HCO3
in the urine
C. excreting NH3 (ammonia)
in the urine
D. breathing out CO2 from
the lungs
If the pH of a patient's blood
B
is 7.4, then it can be said that
the patient has:
A. acidic blood
B. alkaline blood
C. neutral blood
D. alkalosis
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Which of the following would
Acids, Bases and Buffers MCQ Flashcards | Quizlet
C
happen when hydrochloric
acid is added to
water?
A. the acid would react with
water to from a low
concentration of hydronium
ions.
B. the acid would react with
water to from a high
concentration of hydroxide
ions.
C. the acid would react with
water to from a high
concentration of hydronium
ions.
D. the acid would react with
water to from a high
concentration of bicarbonate
ions.
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If the pH of the stomach
Acids, Bases and Buffers MCQ Flashcards | Quizlet
C
contents changed from 3 to 2,
which of the following
is true?
A. at pH 2, the concentration
of hydronium ions is two
thirds of the concentration
at pH 3.
B. at pH 3, the concentration
of hydronium ions is 50%
more than the concentration
at pH 2.
C. at pH 2, the concentration
of hydronium ions is ten times
the concentration
at pH 3.
D. at pH 3, the concentration
of hydronium ions is ten times
the concentration
at pH 2
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The carbonic acid and
Acids, Bases and Buffers MCQ Flashcards | Quizlet
A
bicarbonate buffer system is
one if the buffers that help
to maintain the blood's pH
within the healthy range by
doing which of the
following?
A. carbonic acid destroys
excess base in the blood
while bicarbonate destroys
excess acid.
B. carbonic acid destroys
excess acid in the blood while
bicarbonate destroys
excess base.
C. carbonic acid and
bicarbonate destroy excess
acid.
D. carbonic acid and
bicarbonate destroy excess
base.
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. In a solution like blood that
Acids, Bases and Buffers MCQ Flashcards | Quizlet
D
is buffered to minimise
changes in pH, what
determines
the pH of the solution?
A. the concentration of the
hydronium ions
B. the logarithm of the
concentration of the
hydronium ions
C. the ratio of the
concentration of hydronium
ions to hydroxide ions.
D. the ratio of the
concentrations of the two
components of the buffer.
When in solution, an acidic
D
drug also exists as its salt.
What feature does the
salt of a drug have that may
not be shared by the acid
form of the drug?
A. The salt of the drug does
not carry an electrical charge
but the acid form
does.
B. The salt of the drug may be
more soluble in lipid than the
acid form of the
drug.
C. The acid form of the drug is
ionised whereas the salt is
not.
D. The salt of the drug may be
more soluble in water than
the acid form of the
drug.
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Which one of the following
Acids, Bases and Buffers MCQ Flashcards | Quizlet
D
best defines an acid?
A. an aqueous solution with a
pH of less than 7.0
B. a substance that reacts with
water to produce hydrogen
ions
C. a substance that reacts
with water to produce
hydroxide ions
D. a substance that reacts with
water to produce hydronium
ions
Which one of the following
D
acids is not normally found in
the body?
A. hydrochloric acid
B. carbonic acid
C. nucleic acid
D. acetylsalicylic acid
If a sample of blood has a pH
D
of 7.25, which of the following
is true?
A. it is in the healthy range
B. it is neutral
C. it is acidic
D. it is basic
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If a blood sample has a pH of
Acids, Bases and Buffers MCQ Flashcards | Quizlet
A
7.25, which of the following is
NOT true?
A. the blood is acidic
B. the person may be
suffering from metabolic
acidosis
C. the person may be
suffering from respiratory
acidosis
D. the blood is alkaline
Why does drinking acidic
C
solutions such as orange juice
NOT make the blood
acidic?
A. Blood is alkaline and
alkaline solutions react with
ingested acids to neutralise
them.
B. The volume of water in the
body is great enough that the
effect of ingested
acidic food and drink on pH is
negligible.
C. The blood has buffers
whose components are able
to resist changes to blood
pH.
D. The kidney is able to
rapidly filter acidic
components from blood to
avoid
pH changes.
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If the pH of a sample of
Acids, Bases and Buffers MCQ Flashcards | Quizlet
D
blood was 7.4, which term
below would be applied to
it?
A. acidotic
B. acidic
C. alkalotic
D. alkaline
Three of the solutions below
A
have the SAME level of acidity
(or alkalinity), the
other is different. Which is the
different one?
A. blood
B. a neutral solution
C. a solution with pH = 7
D. a solution with a hydrogen
ion concentration of 10-7
mol/L
Which of the following
C
statements is a definition of a
buffer solution?
A. one where the number of
osmoles of solute equals the
number of moles.
B. one where the
concentration of hydronium
ions equals the concentration
of
hydroxide ions.
C. a solution that resists
change to its pH.
D. a solution that reacts partly
with water to produce a
relatively low concentration
of hydronium ions.
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Which of the following
Acids, Bases and Buffers MCQ Flashcards | Quizlet
B
solutions is the most acidic?
A. blood plasma
B. gastric juice
C. a solution with pH = 7
D. a solution with hydronium
ions at a concentration of 10-5
moles/L
Pure water contains small but
D
equal amounts of hydronium
(H3O+) ions and
hydroxide (OH−) ions. This
means that water is:
A. acidic
B. basic
C. acidic and basic
D. neither acidic nor basic
What do we call a substance
D
that when added to water,
reacts with water to
produce hydronium ions?
A. an ionic compound
B. a base
C. an electrolyte
D. an acid
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One of the statements below
Acids, Bases and Buffers MCQ Flashcards | Quizlet
D
about buffers is correct.
Which one?
A. a buffer consists of an acid
and a base.
B. a buffer will react with
water to produce hydronium
ions.
C. a solution that is neither
acidic nor basic is called a
buffer.
D. the components of a buffer
are conjugate pairs.
An acid may be defined as a
D
substance that:
A. reacts completely with
water producing a high
concentration of hydronium
ions
B. reacts with water to
produce hydroxide ions
C. produces a pH of more
than 7 when in solution
D. reacts with water to
produce hydronium ions
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One of the statements below
Acids, Bases and Buffers MCQ Flashcards | Quizlet
B
about buffers is WRONG.
Which one?
A. a buffer consists of a weak
acid and its slightly basic salt.
B. a buffer will react with
water to produce hydronium
ions.
C. a solution that resists
change to its pH is called a
buffer.
D. the components of a buffer
are conjugate pairs.
An acid may be defined by
B
which one of the following
statements?
A. a substance with equal
concentrations of hydronium
and hydroxide ions.
B. a substance that reacts
partly with water to produce
hydronium ions
C. a substance that maintains
the pH of the solution it is in.
D. a substance that reacts with
water producing hydroxide
ions.
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Which of the following
Acids, Bases and Buffers MCQ Flashcards | Quizlet
B
defines an acid?
A. when in solution, resists
change to pH
B. reacts with water to
produce hydronium ions
C. reacts with a buffer to
produce water
D. has a pH of more than 7.
Which of the following is NOT
D
an acid?
A. a solution having a pH of 3.
B. a substance which reacts
with water to produce
hydronium ions.
C. carbonic acid.
D. a solution that resists
change to its pH
What effect would a base
B
have when added to the
following solutions?
A. Tap water: - it would react
to produce hydronium ions.
B. Tap water: - it would react
to produce hydroxide ions.
C. Buffered water: - it would
raise the pH of the solution.
D. Un-buffered water: - it
would lower the pH of the
solution.
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What effect would an acid
Acids, Bases and Buffers MCQ Flashcards | Quizlet
A
have when added to the
following solutions?
A. Tap water: - it would react
to produce hydronium ions.
B. Tap water: - it would react
to produce hydroxide ions.
C. Buffered water: - it would
lower the pH of the solution.
D. Un-buffered water: it
would raise the pH of the
solution
A fresh sample of blood (a
C
buffered solution) is
withdrawn from the body and
its pH measured at 7.4. A small
quantity of strong acid (as an
isotonic solution)
is added to it. Which of the
following values is most likely
to be the pH of the
resulting blood solution?
A. 3.0
B. 7.3
C. 7.4
D. 7.5
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Blood in the body is different
Acids, Bases and Buffers MCQ Flashcards | Quizlet
C
to a buffered solution held in
a beaker. This is
because hydronium
(hydrogen) ions can be
removed from solution in
blood
almost immediately by:
A. filtration in the kidney from
where it is eliminated from the
body in urine.
B. combining with hydroxide
ions to form water which is
eliminated as urine.
C. combining with
bicarbonate to form carbonic
acid which disassociates to
water and carbon dioxide
which is breathed out.
D. reacting with monohydrogen phosphate to form
di-hydrogen phosphate.
The definition of an acid is a
D
substance that reacts:
A. completely with water to
produce a large
concentration of hydronium
ions.
B. with water to produce
hydroxide ions.
C. with a base to produce a
neutral salt.
D. with water to produce
hydronium ions.
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Choose the INCORRECT
Acids, Bases and Buffers MCQ Flashcards | Quizlet
A
statement about buffer
solutions.
A. the pH of a buffer does not
change on addition of acid or
base.
B. a buffer has two
components which may be a
weak acid and its salt.
C. a buffer has two
components which may be a
weak base and its salt.
D. pH of a buffer depends
only on the ratio of its
components.
In the condition known as
C
acidosis, the blood pH would
be
A. greater than 7.45.
B. less than 7.45.
C. less than 7.35.
D. less than 7.00.
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A buffer solution consisting of
Acids, Bases and Buffers MCQ Flashcards | Quizlet
D
H2PO4
− (acid) and HPO4
2− (base), in a ratio of
1:4, maintains the pH at 7.4.
What is the ratio of these two
components if the
pH were to become 8.4 after
the addition of more of the
basic component of the
buffer?
A. 1:5
B. 2:4
C. 1:8
D. 1:40
Which of the following pH
C
values would you expect to a
dilute solution of a
weak base to have?
A. 2.4
B. 6.2
C. 8.2
D. 12.4
A buffer solution having a pH
B
of 8.5 has a small amount of
strong acid added to
it. What is its pH value likely to
be closest to?
A. 5.0
B. 8.4
C. 8.6
D. 12.4
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Which of the following
Acids, Bases and Buffers MCQ Flashcards | Quizlet
D
statements about the role of
the kidneys or lungs in the
maintenance of acid-base
balance within the body is
FALSE?
A. The kidneys are able to
affect several buffer systems
but the lungs affect
only one.
B. The lungs exert their
influence on the carbonic
acid/bicarbonate buffer
system.
C. Neither the lungs nor the
kidneys have much influence
over the protein
buffer.
D. The kidneys are able to
respond more rapidly than
the lungs to changes in
acid-base balance.
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