Acid-Base+Equilibrium+FR+worksheet - AP Acid-Base...

AP* Acid-Base Equilibrium Free Response Questions
page 1
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Essay Questions
1986
H
2
SO
3
HSO
3
−
HClO
4
HClO
3
H
3
BO
3
Oxyacids, such as those above, contain an atom bonded to one or more oxygen atoms; one or more of
these oxygen atoms may also be bonded to hydrogen.
(a) Discuss the factors that are often used to predict correctly the strengths of the oxyacids listed above.
(b) Arrange the examples above in the order of increasing acid strength.
1990
Give a brief explanation for each of the following.
(a) For the diprotic acid H
2
S, the first dissociation constant is larger than the second dissociation constant
by about 10
5
( K
1
= 10
5
K
2
).
(b) In water, NaOH is a base but HOCl is an acid.
(c) HCl and HI are equally strong acids in water but, in pure acetic acid, HI is a stronger acid than HCl.
(d) When each is dissolved in water, HCl is a much stronger acid than HF.
1994
A chemical reaction occurs when 100. milliliters of 0.200 - molar HCl is added dropwise to 100. milliliters
of 0.100 - molar Na
3
PO
4
solution.