Ph And Poh Calculations Worksheet With Answers Page 5
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6Part 2: continued
4.
A.
Write the equation for the dissociation of aluminum hydroxide.
3+
1-
Al
Al(OH)
(aq)
(aq)
+ 3 OH
(aq)
3
-5
-5
2.36x10
M
7.08x10
M
B.
If the pH is 9.85, what is the concentration of the aluminum hydroxide solution?
pH
pOH
14
-
-5
pOH
-
log
[OH
]
. 7
08
x
10
M
5 -
9.85
pOH
14
2
.36
x
10
M
-
3
4.15
-
log
[OH
]
pOH
4.15
nd
-
2
log
-
4.15
[OH
]
-
-5
[OH
]
7.08
10
M
5.
A.
Write the equation for the dissociation of calcium hydroxide.
2+
1-
Ca
Ca(OH)
(aq)
(aq)
+ 2 OH
(aq)
2
-3
-5
2.18x10
M
4.37x10
M
B.
If the pH is 11.64 and you have 2.55 L of solution, how many grams of calcium hydroxide are in
the solution?
-3
pH
pOH
14
2.18
10
M
-
pOH
-
log
OH
3
2
. 4
37
10
M
11.64
pOH
14
-
2.36
-
log
[OH
]
pOH
2.36
nd
-
2
log
-
2.36
[
OH
]
-
-3
[OH
]
4.37
10
M
x
mol
Ca(OH)
mol
3 -
3 -
2
M
2.18
10
M
x
5.57
10
mol
Ca(OH)
2
L
L
74
g
Ca(OH)
3 -
2
x
g
Ca(OH)
5.57
10
M
0.412
g
Ca(OH)
2
2
1
mol
Ca(OH)
2
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