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WorksheetsU9 Acid Base Practice Exam
Total questions: 32
Worksheet time: 27mins
A student tested a 0.1 M aqueous solution and made
the following observations:
• conducts electricity
• turns blue litmus to red
• reacts with Zn(s) to produce gas bubbles
Which compound could be the solute in this
solution?
HBr
LiOH
LiBr
CH3OH
Based on Reference Table F, which of these salts is
the best electrolyte?
silver chloride
barium sulfate
sodium nitrate
magnesium carbonate
A student was given four unknown solutions. Each
solution was checked for conductivity and tested
with phenolphthalein. The results are shown in the
data table below.
Based on the data table, which unknown solution
could be 0.1 M NaOH?
A
B
C
D
Water containing dissolved electrolyte conducts
electricity because the solution contains mobile
ions
molecules
electrons
atoms
Which species is classified as an Arrhenius base?
PO43-
CH3OH
LiOH
CO32-
Which ion is the only negative ion present in an
Arrhenius base?
hydronium ion
hydride ion
hydrogen ion
hydroxide ion
A solution of a base differs from a solution of an
acid in that the solution of a base
is able to cause an indicator color change
is able to conduct electricity
has a greater [OH–]
has a greater [H3O+]
Which substance can be classified as an Arrhenius
acid?
HCl
KOH
NaCl
LiOH
Which pH change represents a hundredfold
increase in the concentration of H3O+?
pH 5 to pH 7
pH 4 to pH 3
pH 3 to pH 1
pH 13 to pH 14
Which statement correctly describes a solution
with a pH of 9?
It has a higher concentration of OH– than H3O+ and causes methyl orange to turn red.
It has a higher concentration of H3O+ than OH– and causes methyl orange to turn yellow.
It has a higher concentration of H3O+ than OH– and causes litmus to turn blue.
It has a higher concentration of OH– than H3O+ and causes litmus to turn blue.
Given the following solutions:
Solution A: pH of 10
Solution B: pH of 7
Solution C: pH of 5
Which list has the solutions placed in order of
increasing H+ concentration?
C, A, B
B, A, C
A, B, C
C, B, A
A solution at 25ºC with a pH of 7 contains
more H3O+ ions than OH– ions
fewer H3O+ ions than OH– ions
an equal number of H3O+ ions and OH– ions
no H3O+ ions or OH– ions
Adding 0.1 M NaOH to a 0.1 M solution of HCl will
cause the pH of the solution to
decrease
increase
remain the same
In which solution will thymol blue indicator appear
blue?
0.1 M KOH
0.1 M H2SO4
0.1 M CH3COOH
0.1 M HCl
A solution with a pH of 11 is first tested with
phenolphthalein and then with litmus. What is the
color of each indicator in this solution?
Phenolphthalein is colorless and litmus is blue.
Phenolphthalein is pink and litmus is blue.
Phenolphthalein is pink and litmus is red.
Phenolphthalein is colorless and litmus is red.
The ability of H2SO4(aq) to change blue litmus red
is mainly due to the presence of
SO42–(aq) ions
H3O+(aq) ions
H2O molecules
SO2 molecules
One acid-base theory states that an acid is
an OH- donor
an electron donor
a neutron donor
an H+ donor
Given the reaction:
NH3 + H2O ↔ NH4+ + OH–
The water acts as the
electron donor
base
proton acceptor
acid
Given the reaction at equilibrium:
S2– + H2O ↔ HS– + OH–
Which species acts as base by accepting a proton in
the forward reaction?
S2–
H2O
HS–
OH–
Which species is amphoteric?
Cl–
H2S
HS–
HCl
In the reaction
NH3 + H2O ↔ NH4+ + OH–
A conjugate acid-base pair is
H2O and NH4+
NH3 and H2O
H2O and OH–
NH3 and OH–
Which type of reaction will produce water and a
salt?
saponification
esterification
neutralization
fermentation
Given the reactions X and Y below:
X: H2O + NH3 → NH4+ + OH–
Y: H2O + HSO4– → H3O+ + SO42–
Which statement describes the behavior of the
H2O in these reactions?
Water acts as an acid in both reactions.
Water acts as an acid in reaction X and as a
base in reaction Y.
Water acts as a base in both reactions.
Water acts as a base in reaction X and as an
acid in reaction Y.
Which reactants form the salt CaSO4(s) in a
neutralization reaction?
H2SO3(aq) and Ca(NO3)2(aq)
SO2(g) and CaO(s)
H2S(g) and Ca(ClO4)2(s)
H2SO4(aq) and Ca(OH)2(aq)
What is the pH of a solution that results from the
complete neutralization of an HCl solution with a
KOH solution?
1
7
10
4
Which process uses a volume of solution of known
concentration to determine the concentration of
another solution?
titration
substitution
transmutation
distillation
How many hydroxide ions are needed to completely
neutralize 1.0 liter of 0.50 M HCl?
1.5 × 1023 ions
12 × 1023 ions
3.0 × 1023 ions
6.0 × 1023 ions
What is the molarity of a nitric acid solution, HNO3, if 20.0 mL of the solution is needed to exactly
neutralize 10.0 mL of a 1.67 M NaOH solution?
0.334 M
1.67 M
0.835 M
3.34 M
BONUS:
What is the pH of a 0.001 M HNO3 solution?
1
2
3
11
In a titration experiment, a student uses a 1.4 M
HBr(aq) solution and the indicator
phenolphthalein to determine the concentration
of a KOH(aq) solution. The data for trial 1 is
recorded in the table below.
In the space provided on your answer sheet,
calculate the molarity of the KOH(aq) solution for
trial 1. Show all work and be sure to express your
answer in the proper units and to the proper
number of significant figures.
Base your answers to the following questions on the information below.
The relative amount of acid or base in the soil can affect the flowers and plants that grow there.
Hydrangeas, commonly called "snow ball" bushes, will have blue flowers if the soil is acidic and pink
blossoms if the soil is basic.
a A Hydrangea plant is producing blue flowers. Is the pH of the soil above, below, or at the pH of 7?
Explain your answer.
b An indicator, bromthymol blue was used to test the soil. What color would you expect the indicator to be?
Four flasks each contain 100 milliliters of aqueous solutions of equal concentrations at 25°C and 1 atm.
a )Which solutions contain electrolytes?
b )Which solution has the lowest pH?
c) What causes some aqueous solutions to have a low pH?
d )Which solution is most likely to react with an Arrhenius acid to form a salt and water?
e )Which solution has the lowest freezing point? Explain your answer.
