Matching (Value 8)
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Match each item with the correct statement below. a. | acid dissociation constant | d. | Lewis acid | b. | diprotic
acid | e. | pH | c. | hydrogen-ion
donor |
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1.
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can accept an electron pair
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2.
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acid with two ionizable protons
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3.
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Brønsted-Lowry acid
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4.
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negative logarithm of the hydrogen ion concentration
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5.
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ratio of the concentration of the dissociated to the undissociated form
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Match each item with the correct statement below. a. | salt hydrolysis | d. | equivalence point | b. | end point | e. | buffer capacity | c. | titration |
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6.
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process of adding a known amount of solution of known concentration to
determine the concentration of another solution
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7.
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The number of moles of hydrogen ions equals the number of moles of hydroxide
ions.
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8.
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Indicator changes color.
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Multiple Choice (Value 15) Identify the choice that best completes the statement or answers
the question.
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9.
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What characterizes a strong acid or base?
a. | polar covalent bonding | b. | complete ionization in
water | c. | ionic bonding | d. | presence of a hydroxide or hydrogen
ion |
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10.
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What is another name for the acid dissociation constant?
a. | equilibrium constant | c. | rate constant | b. | ionization constant | d. | mole fraction |
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11.
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How many ionization constants are associated with oxalic acid?
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12.
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A 0.12M solution of an acid that ionizes only slightly in solution would
be termed ____.
a. | concentrated and weak | c. | dilute and weak | b. | strong and dilute | d. | concentrated and
strong |
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13.
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Which of the following pairs consists of a weak acid and a strong base?
a. | sulfuric acid, sodium hydroxide | c. | acetic acid, sodium
hydroxide | b. | acetic acid, ammonia | d. | nitric acid, calcium hydroxide |
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14.
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The ionization constant ( K) of HF is 6.7 10 . Which of the following is true in a 0.1 M solution of this acid?
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15.
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If an acid has a K = 1.6 10 , what
is the acidity of the solution?
a. | acidic | c. | neutral | b. | basic | d. | The answer cannot be
determined. |
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16.
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Which acid has the greatest acid dissociation constant?
a. | nitric acid | c. | carbonic acid | b. | acetic acid | d. | boric acid |
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17.
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Which base is strong, but never concentrated?
a. | magnesium hydroxide | c. | ammonia | b. | sodium hydroxide | d. | water |
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18.
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A base has a K of 2.5 10 . Which of the
following statements is true?
a. | This is a concentrated base. | b. | This base ionizes slightly in aqueous
solution. | c. | This is a strong base. | d. | An aqueous solution of this base would be
acidic. |
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19.
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Which base has the smallest base dissociation constant?
a. | potassium hydroxide | c. | calcium hydroxide | b. | sodium hydroxide | d. | ammonia |
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20.
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The process of adding a known amount of solution of known concentration to
determine the concentration of another solution is called ____.
a. | neutralization | c. | titration | b. | hydrolysis | d. | buffer capacity |
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21.
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In a titration, when the number of moles of hydrogen ions equals the number of
moles of hydroxide ions, what is said to have happened?
a. | The equivalence point has been reached. | b. | The end point has
been reached. | c. | The point of neutralization has been reached. | d. | The titration has
failed. |
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22.
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Acetic acid ionizes in water as follows: Fewer than 1% of ethanoic acid molecules are ionized at any instant. The acetate ion
(CH COO ) is therefore ____.
a. | a poor hydrogen-ion acceptor | c. | a poor hydrogen-ion
donor | b. | a good hydrogen-ion acceptor | d. | a good hydrogen-ion
donor |
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23.
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What kind of ion is contained in salts that produce an acidic solution?
a. | a positive ion that releases a proton to water | b. | a negative ion that
releases a proton to water | c. | a positive ion that attracts a proton from
water | d. | a negative ion that attracts a proton from water |
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Short Answer (Value 15)
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24.
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What is the acid dissociation constant of a weak acid if a concentration of
0.3M gives a hydrogen-ion concentration of 0.001M? (Value 3)
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25.
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How many moles of sulfuric acid are required to neutralize 0.50 mol of sodium
hydroxide? (Value 3)
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26.
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A 25 ml solution of H2SO4 is completely neutralized by 18
ml of 1.0M NaOH. What is the concentration of the H2SO4 solution? (Value
3)
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27.
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What is the hydrogen-ion concentration if the pH is 3.7? (Value 3)
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28.
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Calculate the acid dissociation constant of a weak monoprotic acid if a
0.5M solution of this acid gives a hydrogen-ion concentration of 0.000 1M? (Value
3)
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Essay
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29.
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M = moles/L
pH =
-log[H+]
pH + pOH = 14.00
[H+] =
10-pH pOH = -log[OH-]
Kw = [H+][OH-] =
1.0 x 10-14
[OH-] = 10-pOH
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