Name: 
 

Ch 19 - Acids, Bases and Salts - Section 3 and 4


Matching (Value 8)
 
 
Match each item with the correct statement below.
a.
acid dissociation constant
d.
Lewis acid
b.
diprotic acid
e.
pH
c.
hydrogen-ion donor
 

 1. 

 can accept an electron pair
 

 2. 

 acid with two ionizable protons
 

 3. 

 Brønsted-Lowry acid
 

 4. 

 negative logarithm of the hydrogen ion concentration
 

 5. 

 ratio of the concentration of the dissociated to the undissociated form
 
 
Match each item with the correct statement below.
a.
salt hydrolysis
d.
equivalence point
b.
end point
e.
buffer capacity
c.
titration
 

 6. 

 process of adding a known amount of solution of known concentration to determine the concentration of another solution
 

 7. 

 The number of moles of hydrogen ions equals the number of moles of hydroxide ions.
 

 8. 

 Indicator changes color.
 

Multiple Choice (Value 15)
Identify the choice that best completes the statement or answers the question.
 

 9. 
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
 

 10. 
What is another name for the acid dissociation constant?
a.
equilibrium constant
c.
rate constant
b.
ionization constant
d.
mole fraction
 

 11. 
How many ionization constants are associated with oxalic acid?
a.
0
c.
2
b.
1
d.
3
 

 12. 
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
 

 13. 
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
 

 14. 
The ionization constant (Kmc014-1.jpg) of HF is 6.7 mc014-2.jpg 10mc014-3.jpg. Which of the following is true in a 0.1M solution of this acid?
a.
[HF] is greater than [Hmc014-4.jpg][Fmc014-5.jpg].
c.
[HF] is equal to [Hmc014-8.jpg][Fmc014-9.jpg].
b.
[HF] is less than [Hmc014-6.jpg][Fmc014-7.jpg].
d.
[HF] is equal to [Hmc014-10.jpg][Fmc014-11.jpg].
 

 15. 
If an acid has a Kmc015-1.jpg = 1.6 mc015-2.jpg 10mc015-3.jpg, what is the acidity of the solution?
a.
acidic
c.
neutral
b.
basic
d.
The answer cannot be determined.
 

 16. 
Which acid has the greatest acid dissociation constant?
a.
nitric acid
c.
carbonic acid
b.
acetic acid
d.
boric acid
 

 17. 
Which base is strong, but never concentrated?
a.
magnesium hydroxide
c.
ammonia
b.
sodium hydroxide
d.
water
 

 18. 
A base has a Kmc018-1.jpg of 2.5 mc018-2.jpg 10mc018-3.jpg. 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.
 

 19. 
Which base has the smallest base dissociation constant?
a.
potassium hydroxide
c.
calcium hydroxide
b.
sodium hydroxide
d.
ammonia
 

 20. 
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
 

 21. 
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.
 

 22. 
Acetic acid ionizes in water as follows:
mc022-1.jpgmc022-2.jpg mc022-3.jpg
Fewer than 1% of ethanoic acid molecules are ionized at any instant. The acetate ion (CHmc022-4.jpgCOOmc022-5.jpg) 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
 

 23. 
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
 

Short Answer (Value 15)
 

 24. 
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)
 

 25. 
How many moles of sulfuric acid are required to neutralize 0.50 mol of sodium hydroxide? (Value 3)
 

 26. 
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)
 

 27. 
What is the hydrogen-ion concentration if the pH is 3.7? (Value 3)
 

 28. 
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)
 

Essay
 

 29. 
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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