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Molarity and pH Review

Total questions: 34

Worksheet time: 3hrs 50mins

Name
Class
Date
1.
How many liters would you need to make a 1 M solution if you have 6 mol of Sodium Hydroxide? 
a)
2
b)
3
c)
4
d)
6 
2.
Which sweet tea would you expect to taste the sweetest?
a)
1M
b)
3M
c)
3.1M
d)
2.5M
3.
What is the molarity of 4 grams of sodium chloride in 3,800 mL of solution?
a)
0.018 M
b)
0.018 mol
c)
1.052 M
d)
1.052 mol
4.
Molarity is measured in
a)
moles per kg
b)
mols per L
c)
moles per kJ
d)
moles per mL
5.
What is the molarity in 650. ml of solution containing 63 grams of sodium chloride?
a)
2.4 M
b)
0.86 M
c)
1.7 M
d)
0.54 M
6.
What is the molarity of 3 mole of hydrochloric acid in 3 L of water. 
a)
3
b)
1
c)
6
d)
9
7.
How many moles of NaCl are present in a solution with a molarity of 8.59M and 125 mL of solution?
a)
1.07 gram
b)
62.7 mol
c)
1.07 mol
d)
62.7 grams
8.

What is the molarity of a 0.5L sample of a solution that contains 60.0 g of sodium hydroxide (NaOH)

a)

0.8 M

b)

1.5M

c)

3.0M

d)

6.0M

9.

Electrolytes

a)

don't conduct electricity

b)

conduct electricity

10.

How many grams of solute are dissolved in 125.0 mL of 5.00 M NaCl?

a)

0.625 g NaCl

b)

625 g NaCl

c)

36.56 g NaCl

d)

0.04 mol NaCl

11.

What is the difference between dissolving and dissociating?

a)

dissolving is to simply be incorporated into water, dissociation is the separation of charged particles in water.

b)

dissociating is to simply be incorporated into water, dissolving is the separation of charged particles in water.

c)

dissociation happens with covalently bonded molecules, ionic compounds can only dissolve.

d)

When any substance dissolves in water, the solution becomes electrically conductive.

12.
A(n) ______ is a substance with a pH less than 7
a)
Acid
b)
Alkaline
c)
Base
d)
Buffer
13.
A(n) _______ is a substance with a pH greater than 7.
a)
Base
b)
Acid
c)
Buffer
d)
Water
14.

A pH of 3 is how many times more acidic than a pH of 5?

a)

2

b)

20

c)

10

d)

100

15.

An acid

a)

is a substance that releases H+ ions when dissolved in water

b)

is a substance that does not release any ions when dissolved in water

c)

is a substance that releases OH- when dissolved in water

d)

releases an equal amount of OH- and H+ ions when dissolved in water

16.

Water has a neutral because

a)

it has more H+ ions than OH-

b)

it has more OH- ions than H+

c)

it does not produce any ions

d)

it has an equal amount of H+ and OH- in solution

17.
If the [H3O+1] > [OH-1] the solution is...
a)
acidic 
b)
basic
c)
neutral
18.
If the [H3O+1] = [OH-1] the solution is...
a)
acidic 
b)
basic
c)
neutral
19.
What is the [OH-] if the pH is 4.9?
a)
7.94 x 10-10 M
b)
1.0 x 10-4  M
c)
7.94 x 10-14 M
d)
4.9 x 10-10 M
20.
If [H3O+]=1.7 x 10-3 M, what is the pH of the solution?
a)
2.13
b)
1.81
c)
2.77
d)
2.42
21.
If a solution has a [H+] of
1.2 x 10-4M what is the [OH-]?
a)
8.3 x 10-4M 
b)
8.3 x 10-11M 
c)
1.2 x 1010M 
d)
1.2 x 10-4M 
22.
The [H+] is orange juice is
0.00020 M.  FInd the pH of orange juice.
a)
1
b)
3.7
c)
10.3
d)
13
23.
The [OH-] in a soft drink is
5.00 x 10-12 M.  Find the pH.
a)
0.002
b)
2.7
c)
11.3
d)
14
24.

Which of the following is true about acids (Select ALL that apply)

a)

Taste is bitter

b)

Taste is sour

c)

pH is less than 7

d)

pH is greater than 7

e)

Slippery touch

25.

Which of the following is true about bases (Select ALL that apply)

a)

pH is greater than 7

b)

pH is less than 7

c)

High concentration of hydrogen ions

d)

slippery touch

e)

corrosive to metal

26.

Which gases causes rainwater to have about pH of 5.6?

a)

nitrogen dioxide

b)

carbon dioxide

c)

hydrogen sulfide

d)

sulfuric acid

e)

limestone

27.
Pure water is _______ on the pH scale.
a)
Acid
b)
Base
c)
Neutral
28.

You need to make 250 mls of a 2 M solution of sucrose (C12H22O11). How many grams of sucrose do you need to use?

a)

342.3 g

b)

0.25 g

c)

171.2 g

d)

684.6 g

29.

How would you make a 500 ml solution of 4 M sodium chloride (NaCl)?

a)

Put 500 mls of water with 29.22 g of salt

b)

Put 29.22 g of salt and fill to 500 mls

c)

Put 500 mls of water with 58.44 g of salt

d)

Put 58.44 g of salt and fill to 500 mls

30.

What is molarity?

a)

grams of solute per liter of solution

b)

moles of solute per liters of water

c)

moles of solute per liters of solution

d)

grams of solute per liters of water

31.

If the concentration of hydroxide ions is 3.05 x 10-9, what is the pH?

a)

8.52

b)

5.48

c)

3.28 x 10-6 M

d)

12.8

32.

If the pH is 4.52, what is the pOH?

a)

4.52

b)

10.48

c)

9.48

d)

3.02 x 10-5 M

33.

How much 12 M solution do you need to make 500 mls of 3.5 M solution?

a)

146 mls

b)

300 mls

c)

12 mls

d)

512 mls

34.

If you dilute 250 mls of 5 M solution to 400 mls by adding water, what will the resulting molarity be?

a)

3.13 M

b)

313 M

c)

14.1 M

d)

2.76 M

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