NAME:
AlA{fJ{{
~
PERIOD:
CH 14 HOMEWORK
a. Read pp 657 - 710
b. Review your notes.
c. Answer the following:
1. Write balanced equations that describe the following reactions:
(a) the dissociation of perchloric acid in water
(b) the dissociation of propanoic acid (CH3CH2C02H) in water
e.J.6 CO;
CJ/3
II
(11&)
II.t 0 (j)
~
;;;::?
f6 a
~OjJ
+
ells C/I.; CO~-(~)
(c) the dissociation of the ammonium ion in water
Ai/./.
""'I)
1(,0
•
rJ)
CO
'7
J4 0 -r (,-»'
J-
IIf6
fa ~ )
2. For each of the following aqueous reactions, identify the acid, the base, the conjugate acid, and the conjugate
base.
(a) H20 + H2C03
B
H30+ + HC03-
<--+
A
(b) CsHsNW + H20
/~
<--+
CsHsN + H30+
13
cJ3
(c) HCOl- + CsHsNW
f3
cl3
C~
A
<--+
ell
H2C03 + CsHsN
ce
CA
3. Use Table 14.2 to order the following from strongest to weakest acid.
-/1
I)
I~ ,
<:» At, i<\a... MQ.-t(V..w
,
-.J4
C·ll.c1.l..CT!~{
v
1<'1
HCI02
z: /.lilO
-2..
H20
-I'{
~1.0X{O
~hJ
HCJ!O'_I
> f-JCt()a
NH/
I~
__
.>
S,'
HCI04
/(Q»
10
'f.({)
i>J 1/((
j
I
.> I-Id ()
OVER
J;o t'J-~;J
4;{(.4"1,/dl.
(U,LcI ;;;tL"J'Xl
A/.)
t! -'-
/l..Ltt\.{(
«;
;j,t.~<ltd.
aI
.i"tClU1.<l~-<))
5. Fill in the missing information:
pOH
6.88
I, I J.
Solution a
. q~
Solution b
Solution c
10 •
Solution d
31H)
o. Id.
8
13.0
'6 q
-1
I,
i.
3.11
J
Solution g
7.00
9.63
'1.37
«.3Y-,IO
'il.S?
5.'-1/
a . ("'/.iO
t .
X
X/D
fI
10-14 M
f;
0.027 M
-'I
7.~Y.!O
1.0 x 1O-7M
i «, 1.,1 J
Sf
ft;
- II
110
-10
Solution f
-?
1,
8.4
7.00
Solution e
Acidic, Basic or
Neutral
[OH-]
[W]
pH
I. 0 "1.10
-1
-5
,(, 3 V 10
-9
/.20
• 0/ fa
12.2
tJ
i3
3.9 x 10-6 M
/3
- 13
.J , '7 'X 10
A
-13
Solution h
!3
~ . 3 '110
Ii
6. The pH of a sample of gastric juice in a person's stomach is 2. J. Calculate the pOH, [W], and [OH-].
p
I <1 • 0 0 - ~.
0\-1.:.
I
-
9
1/ ,
i
-
[H-I)
,J, I
10
.:
7, q
::
-ll.!i
[0 Ii -)
.:
10
I.
z:
';(10
-
3
r'1
- Ia.
7,
"'-'
XIO
/"1
7. The pOH of a sample of baking soda dissolved in water is 5.74. Calculate pl-l, [W], and [OH-] for this sample.
D
I
i~
LH.f
r
.:
Iii. 00
J
10
z:
[01-1 - li
.j
-
- s, 7 l{
? ?b
s:
- .$.7 l
t
:
10
s:
--
c:
v,
f
"0
oJ.
.5 XIO
I, 3 1\ l(j
-1
-~
/"1
(>1
8. A solution is prepared by mixing 50.0 mL 0[0.500 M l+Cl and 30.0 mL of8.00 M HN03. Water is then added
until the final volume is 1.00 L. Calculate [W], [OHt and the pH for this solution.
~o--t H tQ
=
("0
Ht'JO 3
j1'\~
• dtf -t
S 00 L ) (. SOo
(,0300
::
;:
t1;.)
(s,
L)
ht*)
O. Od
;
00 ••
S JJl,..f
O.;J t{
nt(t~
s:
;
ht~
hrA
H .,.
If
j-
.o~.s
1.00
O. $77
_ 15. II z.3
[OH -
J -
- I II
:
10
J,
78 X
10
M
9. What are the major species present in 0.250 M HCN? Calculate the pH.
Iv1a101
,(}~<.
HttJ
(0..4)
.
I
I.
. ,;tSO
C
- y
f
-
0
f-ICfJ
H -t (~)
~
~-
+
-
LM
(to.~)
0
-ti<
tV
)C
)(
[H-I
-Ii)
z
{g. ,1-f..IO
(x)('X
-. dS-X
[HtN]
xl-
s:
'X-
)
-~
.d.s
.lS
z:
1.5S)(IO
1.24)(10
--
-/0
Cr., .;)'110
- 10
1-/10
0
.~S·'X
J teN-J
______
---7-
a..,.J.
- t. r) X 10
(100)
;: .OOSO%
J
-5
l.aLl'l.IO
X
;;.
j-Hf1::
r-
~
.
.J
_s
l.d'I
x 10
t'i
--- ..-.-------.'.~
..---'--~
...• -"/ pH;:
I-/.? 0 7 :
.
- ._---_.
._._.)
__
OVER
-~-
._.
---
--.
10. A 0.0560 g sample of acetic acid is added to enough water to make 50.0 mL of solution.
[CH3COO-J, [HC2HJ02],
and the pH at equilibrium.
K. for acetic acid is 1.8 x 10-5.
IHC2.. t--1-50 z."'J::
.
OS~O
CzJ~ 0,,-- \ ~"M-f H Cl. {.J3 01..
\
\ uO.O!o j t-iC~I--I.10l- I
jH
\..
c'-- ~bOz.
H
-
H+ (,)
({).f) ~
,01 Of
'6 \0
_L
C;;. ~f3 () ~-
oJ
.Ol~~
-.
;<.
[H~] [ eli-I
J
OL - ]
(t•.
~)
')(
X
..-(y)('d
.ol~Io-Y
-5
z:
.OSOL
t-Y
+'X
t
[W],
0
0
c.
Calculate
z
1.8 'f 10
[HCl-MjOI.]
X
_.$
2
3,110
.1
3.35;f..IO
5.71 'fro
- if
r-.
II. Monochloroacetic
acid (HC2H2CI02) is a skin irritant that is used in "chemical peels" intended to remove the
top layer of dead skin from the face and ultimately improve the complexion.
The value of K. for monochloroacetic
acid is 1.35 x 10-3. Calculate the pH of a 0.10 M solution of monochloroacetic
acid.
111
II
M 2..
1 '1 '-L
.r
. ,0
C
-f
f
_
I.\.
'u
_~vJ
II-T().
-?
<:-
'1
.~
~..
o
[l-l~J[C'l-ii/!Qat,-]
(y)(l()
-------
-
::
[HC21~t (~fO~]
--3
1\ 3S'i-! 0
:::
Ii ::O,OI/G
XL
,01 \ io
~\
---
X~
?
-3
1,3S"iIO
'!C
C.,i-llCJO,-(~d
•••.
0
..I - IC
I,J
1\
fM)
('1t.A
.-
o/1
I'J\ /'
c
>
/
!~.
(J
, I
(~OO)
.
=
•,- X
12.Using the K, values in Table 14.2, calculate the percent dissociation in a 0.20 M solution of each of the following
acids.
(a) nitric acid (HN03)
HtJ03 (~l
IJ{)3-
H-r(tL~) -t
-7
10
(tI~)
/00
DI5S0Cf,tJT!OIV':
%
(b) nitrous acid (HN02)
HrJ Oa.
-"'"
H+ (6.~)
..--:-
(o.~ ')
o
t:
,~O
C
~
.:i--I
-"f.
[H-+] [I\.lCz.-J
«Q .:
J
[1-\1'101.
-3
f, q<fX fO
-I{
Aj,O'(...(D
.:
~,q
"1-::
,01
o
t.f y (
-.3
J3. For chlorous acid CHeIO! K.
-"7
HC.QO;}. CC\f'
H T C~)
~
T
.:l~
0
C
-r.
+?<
~
• ;)'"d.- Y
=
1.2 X 10"2), calculate the [W], pH, and percent dissociation of a 0.22 M solution.
+
ffl
,'}01- (ev)
,OIJ,-y.
X 2..f
,0 I,)
"I
-.
1.;),'/-/0
(X)(
z:
x)
• 02) -"'f
- ,0IL!-i
2-
t
00 2-(0
,(
(,012-)2-_
=-
0
N)(')(-,QOI...'</r)
d-.
y
~
=
, oct S 7 ~1
z:
I. 310
\
'II
l~eJlO
L ."
1- ]
• <JO 2(,,({ -
[1"P]
1 pl~
+-Y
-l.
:;
i
0
X
[H" J [C~01.-]
I<~.:
"\
----(Ioo)
-
OVER
\ % ])tS~ --
\
<20.8 ~
\
\
14. In a 0.100 M solution of HF, the percent dissociation is 8.1%. Calculate Ka-
e;:::? H
HFc~)
C.
- X
E
.I-X
~" [H-lJ " IF -J
F- (~)
0
0
+X
f-X
X
;t'
.100
I
+ (~) +
_~)
k'~::
lJ-t-i] [F-J
(~.
(X) (X)
-
kC\. =
.;
.1-"1-
[HFj
15. Calculate the pH of a 0.20 M solution of iodic acid, HI03•
HI03
(O-~'
I-rt(~) +
~
. ac
0
0
C.
-~
+~
+"'1
E
.a-)C
1-
I<~:.
[141')
I ( .:
• o3l{ - • I 1 y:
z:
I
C.
E
-::>
~
0
-"/
-t-x
. IS-Y
X
'X ::
lHt J
-_.o_o_<f_-_-. _0
{"C.17)l. -
_
(<f)(t)(-.O.N)
d-.
._-
-=
[\1+J = 0.1\8
r1
,~--------------~
Calculate Ka.
("~ ')
+y
"I
_J
X
rw\U1-"w
ti.S'(.IO
sz:
[1-1 -oj
z:
s.ol. ,ob . t S
z:
(, 03) ( . ( S) =
r~1
_3
[4-) .:
lWt.)]
z
4,$'110
M
O.N S$ fVl
-3
I<Q;-
[Hi')
--
LA-J
l\-\A]
}
0
_3
-:
"1.10 - ~
0, 9J?
z,
'X
cL~o-c:.o..kJ
3.0'70
tl}C
.J..-y.
H + (().~)~ A
, IS
If
-,
;[:1
Y. .:
16. A 0.15M solution ofa weak acid, HA, is 3.0% dissociated.
l~A('1"
octJ
= 0.17
_ . f/:!::
()()(~)
z:
J
X.
0.
X
[ro3-]
[HIO"3
K,
z:
7...
I0
( . oqz. )
X \.
..L03- (6];)
J:
f)(
\.
M
.1 _(~"'I-(03)
=
ioo)
(.08'))(.
-3
'6,1 X/O
s:
[HI-J
~
( L/.
2-
s ~to )
----.
It{ 5j
s:
I
l~
-I(
if X fO
It'
J
'I..,s
X (0