pH & Molarity
Name: ________________________________
Date: ______________ Block:
______________
1.
Calculate pH and pOH for the following
solutions :
a) [H+] = 1.0 x 10-5 M
b) [OH-] = 3.0 x 10-8 M
c) [H+] = 2.5 x 10-2
d) [OH-] = 7.5 x 10-3 M
2.
Calculate [H+] and [OH-] for the following :
a) pH = 3.0
b) pOH = 2.60
c) pOH = 5.63
d) pH = 7.51
Molarity
3. What is the molarity of a solution that contains 2.88 moles in 750 mL?
4. How many liters are in a 3.00 x 10-2 M solution containing 0.444 moles?
5. How many moles of would you need to make 3200 mL of 12.0 M solution?
6. A chemist pours 0.750 L of a 3.00 M solution of NaOH into a volumetric flask and fills the flask up
with water. If the new molarity is 2.25 M, what is the final volume of the solution?
7.
What is the molarity of a solution that contains 4.53 moles of lithium nitrate in 2.85 liters of solution?
8.
What is the molarity of a solution that contains 0.00372 moles hydrochloric acid in 2.39 x 10 -2 liters of solution?
9.
A flask contains 85.5 g C12H22O11 (sucrose) in 1.00 liters of solution. What is the molarity?
10. A beaker contains 214.2 grams osmium (III) fluoride in 0.0673 liters of solution. What is the molarity?
11. Calculate the molarity if a flask contains 1.54 moles potassium sulfate in 125 ml of solution.
pH Worksheet #3
12.
pH
a
b
c
d
[OH-] = 1.58 x 10-9 M
[H+] = 2.35 x 10-4 M
pH = 8.26
pOH = 10.2
pOH
[H+]
xxxxxxxxx
xxxxx
xxxxx
[OH−]
xxxxxxxx
ANSWERS :
1. pH
a) 5.00
b) 6.48
c) 1.60
d) 11.88
pOH
9.00
7.52
12.40
2.12
2.
a)
b)
c)
d)
[H+]
1 x 10-3 M
4.0 x 10-12 M
4.3 x 10-9 M
3.1 x 10-8 M
[OH-]
1 x 10-11 M
2.5 x 10-3 M
2.3 x 10-6 M
3.2 x 10-7 M
Answers
3) 3.84 M 4) 14.8 L 5) 38.4 mol 6) 1.00 L 7) 1.59 M LiN03 8) 0.156 M HCL 9) 0.250 M sucrose
10) 12.9 M OsF3 11) 12.3 M K2SO4
Answers
12a) pH = 5.2, pOH = 8.8, [H+] = 6.31 x 10-6 M
12b) pH = 3.6, pOH = 10.4, [OH-] = 3.98 x 10-11 M
12c) pOH = 5.74, [H+] = 5.50 x 10-9 M, [OH-] = 1.82 x 10-6 M
12d) pH = 3.8, [H+] = 1.58 x 10-4 M, [OH-] = 6.31 x 10-11 M
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