Ph And Poh Calculations Worksheet With Answers Page 4
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6Part 2: For each of the problems below, assume 100% dissociation.
1.
A.
Write the equation for the dissociation of hydrochloric acid.
1+
1-
HCl(aq) H
(aq) + Cl
(aq)
B.
Find the pH of a 0.00476 M hydrochloric acid solution.
1+
1-
HCl(aq) H
(aq) + Cl
(aq)
0.00476 M
0.00476 M
pH
-
log
[H
]
pH
-
log
[0.00476
M]
pH
2.32
2.
A.
Write the equation for the dissociation of sulfuric acid.
1+
2-
(aq) 2 H
H
SO
(aq) + SO
(aq)
2
4
4
B.
Find the pH of a solution that contains 3.25 g of H
SO
dissolved in 2.75 liters of solution.
2
4
1
mol
H
SO
2
4
Step
: 1
x
mol
H
SO
3.25
g
H
SO
. 0
033
mol
H
SO
2
4
2
4
2
4
98
g
H
SO
2
4
0.033
mol
H
SO
mol
2
4
Step
2
:
M
M
M
0.0121
M
H
SO
2
4
L
2.75
L
2
Step
3
:
H
SO
(
aq
)
2
H
SO
(
aq
)
2
4
4
0.0121
M
0.0242M
Step
4
:
pH
-
log
[H
]
pH
-
log
[0.0242
M]
pH
1.62
3.
A.
Write the equation for the dissociation of sodium hydroxide.
1+
1-
Na
NaOH(aq)
(aq)
+ OH
(aq)
0.000841 M
0.000841 M
B.
Find the pH of a 0.000841 M solution of sodium hydroxide.
-
pH
pOH
14
pOH
-
log
[OH
]
pOH
-
log
[0.000841
M]
pH
. 3
08
14
pOH
3.08
pH
10.92
or
-
K
[H
][
OH
]
pH
-
log[H
]
w
-
14
-
11
1
10
[H
][
. 0
000841
M
]
pH
-
log
[1.19
10
M]
-
11
pH
10.92
[H
]
[1.19
10
M]
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