Last Name:
Chapter 15: Applications
of Acids & Bases
2) Which of the following solutions is a good buffer system? (5 pts)
A) A solution that is 0.10 M NaOH and 0.10 M HCI
B) A solution that is 0.10 M HF and 0.10 M NaC2H302
C) A solution that is 0.10 M HCI and 0.10 M NH4+
@A
solution that is 0.10 .M HC2H302 and 0.10 M LiC2H302
E) None of the above are buffer systems.
THE ANSWER IS LETTER
D
3a) Given the titration of a weak acid with a strong base, e.g.
HC2H302 + OH- ~ C2H302- + H20, would the equivalence point be
CIRCLE ONE:
acidic
neutral
~V
?
(5 pts)
3b) Given the titration of a weak base with a strong acid, e.g.
C2H302- + HCI ~ HC2H302 + cr, would the equivalence point be
~-~
CIRCLE ONE:
~~_/)
neutral
basic
? (5 pts)
Last Name:
Chapter 15: Applications
of Acids & Bases
4) A 1.00 L buffer solution is 0.150 M in HC7Hs02 and 0.250 M in LiC7Hs02.
the addition of 1o~..~~~ of 1.00 M
Calculate the pH of the so!uti~ft~r
HC!. The Ka for HC7Hs02 ,sfS.5x11 0 s.
r
S~(A•.
ExtraCredit:Calculatethe initi~~,\ore
\-\d
-t
A- ~
H-A + Ck
('''-,
'-./
,\
O."LSI'\Q
O',\S.",,,lOr.:
(10 pts)
I'
acidaddition. (5pts) .
-~
f\-\-;:: \1'( k 4-
2 s ,'~\=,~
I
'1 , b
-
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t
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-
-
-
\,
.
-----...
s,G7 - ,Ltb
l-! \~
5) A 100.0 mL sample of O.\t§)MHCI04 is titrated with @M
LiOH.
Determine the pH of the solution after the addition of 30.0 mL of LiOH. (10
pts).
7- S\st:,S
O.
,~V'\~
L
\-\<:--\0'1
)(.
d.1
L
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'I$J
k -:;
f -
Chapter 15: Applications
of Acids
& Bases
- O. 600
o.::.\b
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I
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7a) Write the dissociation equation (5 pts) and the Ksp expression (5 pts) for
PbCb.
7b) Determine the molar solubility of Pb ions and CI ions if Ksp = llix10-5.
3 Stj f~
(5 pts)
K'So
f"::
\ I \ 7 y. • !()- '::.
-=-
(~()1S \ , "2-S,
.
~
l:-t .:) 3
Last Name:
Chapter 15: Applications
of Acids & Bases
c) The molar solubility of Zn ion is 1.6x 10-12 M in pure water. Calculate the
Kspfor ZnS.
7- S"
(5 pts)
\;('SP
\=;~
rL.S1-~J~
r
!;1-;;~ \.\,b )(
'1
-:: L1_"LJ
8) Given the reaction Ag2S04(s)
¢::>
2Ag+ +
10
-,L\J
L
sol- , Ksp=1.2x1 0-5
a) What would happen if you added AgN03 ,(Ksp= 51.6), to the system? (5
pts}."·_-~
r'---~
CIRCLE ONE:
~~~~~s'~
•.
_.~
rxn shifts right
no change
b) What would happen if you added Na2S04 (Ksp=1.2x10-3) to the system?
(5 pts)
-~::::.:::<."""'=""._._--.,..".-~-..
CIRCLE ONE:
~n-----_M~'hifts left
~) rxn shifts right
_. _ ~~",
>-
no change
c) What would happen if you. added NaCI,(Ksp = 36), to the system? (5 pts)
".----
..•
CIRCLE ONE:
rjgh}
------_./
rxn shifts left ~~hiftS
?~\- o~ f.\~CQ
K.sp ~ \
.ff
Y--
no change
fO -11:>
(\-i I ~.\..
)