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Worksheets

Acids & Bases Practice

Total questions: 175

Worksheet time: 4hrs 44mins

Name
Class
Date
1.

If the pH of an acid is 3, then it's pOH will be ...

a)

11

b)

3

c)

14

d)

12

2.

All of the following are strong acids except....

a)

HCl

b)

HBr

c)

HF

d)

HI

3.

All of the following are strong bases except...

a)

NaOH

b)

Ca(OH)2

c)

LiOH

d)

HOH

4.

If the [H+] of a solution is 1 x 10-2 M the pH is

a)

2

b)

12

c)

-2

d)

1

5.
If the pH of a solution is 5 the [H+] is
a)
1.0 x 105  M
b)
1.0 x 109  M
c)
5.0 x 101  M
d)
1.0 x 10-5  M
6.
Limes have a [H3O+] of 1.3 x 10-2 mol/L.  Their pOH is
a)
1.89
b)
12.11
c)
1.03
d)
12.97
7.
if a solution has a pOH of 5.2 the [OH-] of the solution is
a)
6 x 10 -6 M
b)
6.3 x 10 -6 M
c)
1.58 x 10-5 M
d)
2 x 10-5 M
8.

Which of the following statements is true concerning acids and bases?

a)

acids and bases don't react with each other

b)

acids mixed with bases neutralize each other

c)

acids mixed with bases make stronger bases

d)

acids mixed with bases make stronger acids

9.

Which is the correct set of acid properties, as described by Boyle:

a)

sour taste, corrosive, change litmus from red to blue

b)

sour taste, corrosive, change litmus from blue to red

c)

sweet taste, slippery, change litmus from blue to red

d)

sour taste, slippery, change litmus from blue to red

10.

True or false: a neutral solution has equal amounts of H+ and OH-.

a)

True

b)

False

11.

HCl is found in household products, including some toilet bowl cleaners. Is HCl an acid or a base?

a)

Acid

b)

Base

c)

Neither (Neutral)

12.

Ammonia is found in many household products, including window cleaner. What is the pH of ammonia?

a)

It's acidic.

b)

It's basic.

c)

It's neutral.

13.

Is pure water acidic, basic, or neutral?

a)

Acidic

b)

Basic

c)

Neutral

14.

Water found near sources of air pollution tends to be:

a)

Acidic.

b)

Basic.

c)

Neither. Air pollution doesn't alter the pH of water.

15.

Tums and Milk of Magnesia are examples of:

a)

Acids

b)

Antacids

c)

Neither acids nor bases.

d)

Both antacids and bases.

16.

Click on the base.

A
B
C
D
17.

Four substances were tested for pH, lemon juice (pH 2), baking soda (pH 9), bleach (pH 12), and milk (pH 6). Which of the following correctly lists the substances from most basic to acidic?

a)

lemon juice, milk, baking soda, bleach

b)

bleach, baking soda, milk, lemon juice

c)

milk, lemon juice, baking soda, bleach

d)

baking soda, bleach, lemon juice, milk

18.

Which of these is a property of acidic solutions?

a)

they taste sour

b)

they feel slippery

c)

they are in many cleaning products

d)

they taste bitter

19.
Human blood has a pH between 7.35 and 7.45. Which of the following best describes human blood?
a)
strongly acidic
b)
slightly acidic
c)
strongly basic
d)
slightly basic
20.

The table shows the pH of several solutions. Which solution is the most acidic?

a)

vinegar

b)

milk

c)

water

d)

bleach

21.

Zn(OH)2 is an example of a...

a)

acid

b)

base

c)

salt

d)

water

22.

H3PO4 is an example of a ...

a)

acid

b)

base

c)

salt

d)

non-electrolyte

23.

According to the diagram, which part of the digestive system has the most basic enviroment?

a)

Mouth

b)

Stomach

c)

Pancreas

d)

Small intestine

24.

As the pH of a solution gets lower, the solution becomes more _____.

a)

acidic

b)

basic (or alkaline)

c)

neutral

d)

ionic

25.

Predict the products of this reaction.

HCl + Ca(OH)2

a)

NaCl

b)

CaCl2

c)

CaCl2 + H2O

d)

H2O

26.

The pH of 4 solutions were measured in a lab. Which solution is the most acidic?

a)
b)
c)
d)
27.

The pH of 4 solutions were measure in a lab. Which of the solutions is the most basic (alkaline)?

a)
b)
c)
d)
28.

A chemical reaction between an acid and a base, forming a salt and water is known as ____.

a)

ionization

b)

concentration

c)

neutralization

d)

animation

29.

Which is NOT a property of acids?

a)

slippery

b)

pH below 7

c)

dissociate in water

d)

contain H1+ ions

30.

Which is NOT a property of bases?

a)

caustic

b)

corrosive

c)

pH below 7

d)

bitter

31.

Pollution causes the pH of rain water fall below 5. What is such type of rain called?

a)

acid rain

b)

polluted rain

c)

low pH rain

d)

alkaline rain

32.

For a solution, pH + pOH =

a)

7

b)

1.0 x 10-14

c)

14

d)

-log (1.0 x 10-14)

33.

If the pH of a solution is 4.0, what is the pOH?

a)

4.0

b)

1.0 x 10-4

c)

10

d)

Cannot be determined from the information

34.

The pH of a solution is 8.43. What is the hydrogen ion H+ concentration?

a)

3.7 x 10-9 M

b)

2.7 x 10-6 M

c)

1.0 x 10-8.43 M

d)

1.0 x 10-14

35.

If the [H+] of a solution is 1 x 10-2 M, the pH is

a)

2

b)

12

c)

-2

d)

1

36.

If the [OH-] of a solution is 2.7 x 10-4 M, the pOH of the solution is

a)

10.44

b)

3.56

c)

1.00

d)

-4.43

37.

If the [H+] of a solution is 6.8 x 10-9 M, the pH is

a)

8.17

b)

5.73

c)

9.99

d)

8.62

38.

if the [H+] of a solution is 8.4 x 10-3 M, the pOH of the solution will be

a)

2.08

b)

11.92

c)

1.02

d)

12.98

39.

Limes have a [H+] of 1.3 x 10-2 M. Their pOH is

a)

1.89

b)

12.11

c)

1.03

d)

12.97

40.

If the [OH-] of a solution is 2.7 x 10-4 M, the pOH of the solution is

a)

10.44

b)

1.00

c)

3.57

d)

-4.43

41.

If the pH of an acid is 3, then it's pOH will be ...

a)

11

b)

3

c)

14

d)

12

42.

If the pOH of a base is 5, it's pH will be...

a)

2

b)

5

c)

14

d)

9

43.

Which of the following answer choices represents an acidic pH?

a)

1

b)

5

c)

7

d)

9

e)

11

44.

Which of the following pH values represents a basic pH?

a)

1

b)

5

c)

7

d)

9

e)

11

45.

Which of the following pH values represents a neutral pH?

a)

1

b)

5

c)

7

d)

9

e)

11

46.

Which of the following pOH values represents an acidic pOH?

a)

1

b)

5

c)

7

d)

9

e)

11

47.

Which of the following pOH values represents a basic pOH?

a)

1

b)

5

c)

7

d)

9

e)

11

48.

How are pH and pOH related?

a)

pH+pOH = 14pH+pOH\ =\ 14

b)

pH=pOHpH=pOH

c)

pH−pOH=14pH-pOH=14

d)

pH = 1pOHpH\ =\ \frac{1}{pOH}

49.

The picture below shows the relative concentrations of H+ and OH- in a solution. Is the solution an acid or a base?

a)

acid

b)

base

50.
When dissolved in water, bases produce:
a)
acids
b)
salts
c)
hydrogen ions
d)
hydroxide ions
51.

A solution has a pH of 7.0.  What would happen to the pH if H+ ions were added?

a)
pH would go up
b)
pH would go down
c)
pH would stay the same
d)
None of these
52.

A solution has a pH of 7.0. What would happen to the pH if OH- ions were added?

a)

pH would go up

b)

pH would go down

c)

pH would stay the same

d)

None of these

53.

If the [H+] of a solution is 1 x 10-2 M the pH is

a)

2

b)

12

c)

-2

d)

1

54.
If the pH of a solution is 5.6 the pOH is
a)
6.5
b)
12.4
c)
8.4
d)
5.6
55.

If the [H3O+] of a solution is 1 x 10-8 M the [OH-] is

a)

1.0 x 10-6 M

b)

1.0 x 106 M

c)

1.0 x 10-8 M

d)

1.0 x 108 M

56.
if a solution has a pOH of 5.2 the [OH-] of the solution is
a)
6 x 10 -6 M
b)
6.3 x 10 -6 M
c)
1.58 x 10-5 M
d)
2 x 10-5 M
57.
if the [H+] of a solution is 8.4 x 10-3 mol/L the pOH of the solution will be
a)
2.08
b)
11.92
c)
1.02
d)
12.98
58.
A solution with a [H+] of 9.4 x 10-5 mol/L is said to be
a)
Acidic
b)
Basic
c)
Neutral
d)
negative number, no solution.
59.
If the [OH-] of a solution is 2.7 x 10-4 mol/L the pOH of the solution is
a)
10.44
b)
3.56
c)
1.00
d)
-4.43
60.

Find the pH of a 0.000841 M solution of sodium hydroxide

a)

3.07

b)

9.88

c)

10.92

d)

11.23

61.

What is the pOH of a 0.0124 M HCl solution?

a)

1.91

b)

12.09

c)

1.61

d)

12.39

62.

Find the pH of a solution that contains 4.17 g of H2SO4 dissolved in 1.75 liters of solution.

a)

1.31

b)

2.29

c)

3.45

d)

2.02

63.

Which chemical is a proton donor?

a)

Acid

b)

Base

64.

Which chemical is a proton acceptor?

a)

Acid

b)

Base

65.

Which chemical produces an H3O+ when mixed with water?

a)

Acid

b)

Base

66.

Which chemical produces an (OH) when mixed with water?

a)

Acid

b)

Base

67.

Acid mixed with a base will create water and a

a)

neutralizer

b)

precipitate

c)

proton donor

d)

salt

68.

What would be considered the weakest base?

a)

3

b)

14

c)

8.2

d)

11.6

69.
If the [H+] of a solution is 6.8 x 10-9 mol/L the pH is
a)
8.17
b)
8.2
c)
9.99
d)
8.62
70.
if the [H+] of a solution is 8.4 x 10-3 mol/L the pOH of the solution will be
a)
2.08
b)
11.92
c)
1.02
d)
12.98
71.
According to Brønsted-Lowry theory of acids and bases, a base is ___.
a)
a proton acceptor
b)
a proton donor
c)
a compound that dissolves in water to produce OH-
d)
an electron donor
72.

The pH of a solution is 4.00.  What is the hydroxide ion concentration?

a)
[OH-] = 1 x 10-4
b)
[OH-] = 1 x 10-6
c)
[OH-] = 1 x 10-10
d)
[OH-] = 1 x 10-14
73.

Which of the following solutions is most basic?

a)
[H+] = 1 x 10-11
b)
[OH-] = 1 x 10-4
c)
[H+] = 1 x 10-2
d)
[OH-]= 1 x 10-13
74.

What is the pH of a solution with a hydrogen ion concentration of 1.0 x 10-8 M?

a)
-8
b)
6
c)
8
d)
14
75.

What is the pH of a solution that has a [H+] concentration of 1x10-4 ?

a)

10

b)

4

c)

.0001

d)

7

e)

[10-4]

76.

What is the pH of a solution of KOH that has a Molarity of .00034?

a)

3

b)

3.4

c)

11

d)

10.53

77.
phosphorous acid
a)
H3PO4
b)
H2PO4
c)
H3P
d)
H3PO3
78.
bromic acid
a)
HBr
b)
HBrO2
c)
HBrO3
d)
H3BrO3
79.
hydrochloric acid
a)
HCl
b)
HClO
c)
H3ClO3
d)
HClO3
80.
sulfuric acid
a)
HSO3
b)
H2SO3
c)
H2SO4
d)
H3SO4
81.
Mg(OH)2
a)
magnesium hydroxide acid
b)
hydromagnesium acid
c)
magnesium oxygen hydride
d)
magnesium hydroxide
82.
Barium hydroxide
a)
BaOH
b)
Ba2OH
c)
Ba(OH)2
83.
Hydroiodic acid
a)
H2I2
b)
H1I1
c)
HI
84.
Select the name for the following acid: H2S
a)
Hydrosulfuric acid
b)
Sulfuric acid
c)
Sulfurous
85.
chloric acid
a)
HClO3
b)
HClO2
c)
HClO
d)
HCl
86.
What is the formula for sulfuric acid?
a)
HSO3
b)
H2SO3
c)
H2SO4
d)
H3SO4
87.

What is the formula for nitric acid?

a)

HNO2

b)

HNO3

c)

HNO4

d)

H2NO3

88.

Which of the following answer choices represents an acidic pH?

a)

1

b)

5

c)

7

d)

9

e)

11

89.

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

90.

The picture below shows the relative concentrations of H+ and OH- in a solution. Is the solution an acid or a base?

a)

acid

b)

base

91.
When dissolved in water, bases produce:
a)
acids
b)
salts
c)
hydrogen ions
d)
hydroxide ions
92.
If the pH of a solution is 5.6 the pOH is
a)
6.5
b)
12.4
c)
8.4
d)
5.6
93.

If the [H3O+] of a solution is 1 x 10-8 M the [OH-] is

a)

1.0 x 10-6 M

b)

1.0 x 106 M

c)

1.0 x 10-8 M

d)

1.0 x 108 M

94.
if a solution has a pOH of 5.2 the [OH-] of the solution is
a)
6 x 10 -6 M
b)
6.3 x 10 -6 M
c)
1.58 x 10-5 M
d)
2 x 10-5 M
95.
if the [H+] of a solution is 8.4 x 10-3 mol/L the pOH of the solution will be
a)
2.08
b)
11.92
c)
1.02
d)
12.98
96.
A solution with a [H+] of 9.4 x 10-5 mol/L is said to be
a)
Acidic
b)
Basic
c)
Neutral
d)
negative number, no solution.
97.
If the [OH-] of a solution is 2.7 x 10-4 mol/L the pOH of the solution is
a)
10.44
b)
3.56
c)
1.00
d)
-4.43
98.

Find the pH of a 0.000841 M solution of sodium hydroxide

a)

3.07

b)

9.88

c)

10.92

d)

11.23

99.

What is the pOH of a 0.0124 M HCl solution?

a)

1.91

b)

12.09

c)

1.61

d)

12.39

100.

Find the pH of a solution that contains 4.17 g of H2SO4 dissolved in 1.75 liters of solution.

a)

1.31

b)

2.29

c)

3.45

d)

2.02

101.

Which chemical is a proton donor?

a)

Acid

b)

Base

102.

Which chemical is a proton acceptor?

a)

Acid

b)

Base

103.

Which chemical produces an H3O when mixed with water?

a)

Acid

b)

Base

104.

Which chemical produces an (OH) when mixed with water?

a)

Acid

b)

Base

105.

Acid mixed with a base will create water and a

a)

neutralizer

b)

precipitate

c)

proton donor

d)

salt

106.

What would be considered the weakest base?

a)

3

b)

14

c)

8.2

d)

11.6

107.
If the [H+] of a solution is 6.8 x 10-9 mol/L the pH is
a)
8.17
b)
8.2
c)
9.99
d)
8.62
108.
if the [H+] of a solution is 8.4 x 10-3 mol/L the pOH of the solution will be
a)
2.08
b)
11.92
c)
1.02
d)
12.98
109.
Barium hydroxide
a)
BaOH
b)
Ba2OH
c)
Ba(OH)2
110.
Hydroiodic acid
a)
H2I2
b)
H1I1
c)
HI
111.
What is the formula for sulfuric acid?
a)
HSO3
b)
H2SO3
c)
H2SO4
d)
H3SO4
112.

What is the formula for nitric acid?

a)

HNO2

b)

HNO3

c)

HNO4

d)

H2NO3

113.

Which of the properties listed below is not characteristic of an acid?

a)

a. a sour taste

b)

b. a slippery feel

c)

c. the ability to conduct an electric current

d)

d. reactivity with metals

114.

A strong base in a water solution

a)

is a weak electrolyte

b)

produces many H+ ions

c)

will not dissolve

d)

completely dissociates into ions.

115.

How many protons can a diprotic acid (H2SO4 for example), donate?

a)

1

b)

2

c)

3

d)

4

116.

A solution that has a H3O+ concentration equal to 1 x 10-4 is

a)

Neutral

b)

acidic

c)

basic

d)

could be all three

117.

What is the [OH-] in a 0.1 M HCl solution?

a)

1 x10-1 M

b)

1 x 10-7 M

c)

1 x10-13 M

d)

1 x10-14 M

118.

What is the pH of a 0.0001 M HCl solution

a)

1

b)

4

c)

7

d)

11

119.

What is the concentration of hydroxide ions in a solution that has a pH of 6.0?

a)

1 x 106 M

b)

1 x10-6 M

c)

1 x 101 M

d)

1 x 10-8 M

120.

A strip of pH paper

a)

gives a quick approximation of pH.

b)

is a precise measure of pH.

c)

shows very little color change over a wide pH range

d)

must be calibrated with a pH meter before it is used.

121.

Neutral solutions have a pH of

a)

pH of 2

b)

pH of 0

c)

pH of 7

d)

A neutral solution does not have a pH

122.

Which is NOT a property of a base?

a)

Tastes sour

b)

Slippery

c)

Bitter taste

d)

Turns red litmus to blue

123.

An acid’s pH is between :

a)

0 to 6

b)

7

c)

8-14

d)

6-14

124.

What is the concentration of H+ in a solution with a pH of 3?

a)

1.0 x 10-3

b)

3.0 M

c)

10.3 M

d)

103 M

125.

What is the pH of a solution when [H+] = 7.9 x 10-11?

a)

2.4

b)

10.1

c)

7.5

d)

4.8

126.

Which of the following is the hydrogen ion concentration of an acid?

a)

9.2 x 10-14

b)

2.4 x 10-7

c)

1.0 x 10-8

d)

5.7 x 10-11

127.
Strong acids and bases...
a)
do not break apart into ions (non-electrolyte)
b)
partially break apart into ions (weak electrolyte)
c)
completely break apart into ions (non-electrolyte)
d)
completely break apart into ions (strong electrolyte)
128.

Acids have a ______ pH and a _________ pOH

a)

low, high

b)

high, low

c)

An acid will not have a pOH

129.

Which of these solutions is an acid?

a)

Dish Soap: pH of 12

b)

Tomato Soup: pH of 4

c)

Baking Soda: pH of 9

d)

Drain Cleaner: pH of 14

130.

Ammonia has a pOH of 2. Ammonia is __________.

a)

an acid

b)

a base

c)

an element

d)

a metal

131.
A  pH and a pOH will add up to:
a)
0
b)
7
c)
14
d)
1.0 x 10-14
132.

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

133.
A solution has a pH of 7.0.  What would happen to the pH if H ions were added?
a)
pH would go up
b)
pH would go down
c)
pH would stay the same
d)
None of these
134.

A solution has a pH of 7.0. What would happen to the pH if OH- ions were added?

a)

pH would go up

b)

pH would go down

c)

pH would stay the same

d)

None of these

135.
If the pH of a solution is 5.6 the pOH is
a)
6.5
b)
12.4
c)
8.4
d)
5.6
136.

If the [H3O+] of a solution is 1 x 10-8 M the [OH-] is

a)

1.0 x 10-6 M

b)

1.0 x 106 M

c)

1.0 x 10-8 M

d)

1.0 x 108 M

137.
if a solution has a pOH of 5.2 the [OH-] of the solution is
a)
6 x 10 -6 M
b)
6.3 x 10 -6 M
c)
1.58 x 10-5 M
d)
2 x 10-5 M
138.
if the [H+] of a solution is 8.4 x 10-3 mol/L the pOH of the solution will be
a)
2.08
b)
11.92
c)
1.02
d)
12.98
139.
A solution with a [H+] of 9.4 x 10-5 mol/L is said to be
a)
Acidic
b)
Basic
c)
Neutral
d)
negative number, no solution.
140.
If the [OH-] of a solution is 2.7 x 10-4 mol/L the pOH of the solution is
a)
10.44
b)
3.56
c)
1.00
d)
-4.43
141.

Find the pH of a 0.000841 M solution of sodium hydroxide

a)

3.07

b)

9.88

c)

10.92

d)

11.23

142.

What is the pOH of a 0.0124 M HCl solution?

a)

1.91

b)

12.09

c)

1.61

d)

12.39

143.

Find the pH of a solution that contains 4.17 g of H2SO4 dissolved in 1.75 liters of solution.

a)

1.31

b)

2.29

c)

3.45

d)

2.02

144.

Acids have a ______ pH and a _________ pOH

a)

low, high

b)

high, low

c)

An acid will not have a pOH

145.
The pH scale is a range from:
a)
1-7
b)
0-14
c)
1-5
d)
1-20
146.
If the pH of a solution is 7 the solution is said to be
a)
Acidic
b)
Basic
c)
Neutral
d)
Tasty
147.

Which of these solutions is an acid?

a)

Dish Soap: pH of 12

b)

Tomato Soup: pH of 4

c)

Baking Soda: pH of 9

d)

Drain Cleaner: pH of 14

148.

Ammonia has a pOH of 2. Ammonia is __________.

a)

an acid

b)

a base

c)

an element

d)

a metal

149.

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

150.
When dissolved in water, bases produce:
a)
acids
b)
salts
c)
hydrogen ions
d)
hydroxide ions
151.
A  pH and a pOH will add up to:
a)
0
b)
7
c)
14
d)
1.0 x 10-14
152.
A solution has a pH of 7.0.  What would happen to the pH if H ions were added?
a)
pH would go up
b)
pH would go down
c)
pH would stay the same
d)
None of these
153.
If the pH of a solution is 5.6 the pOH is
a)
6.5
b)
12.4
c)
8.4
d)
5.6
154.
The pH of a solution is tested, and it is found to be a basic solution. Of the following choices, what could the pH have been?
a)
3
b)
9
c)
7
d)
5
155.
If the pH of a solution is 5.6 the pOH is
a)
6.5
b)
12.4
c)
8.4
d)
5.6
156.

4. What is the pOH of a solution that has a pH of 4?

a)

10

b)

6

c)

12

d)

7

157.

If the pH of a solution is 7, what is the pOH?

a)

7

b)

1

c)

9

d)

14

158.

If the pOH of a solution is 13, what is the pH?

a)

1

b)

7

c)

14

d)

5

159.

If the pH of a solution is 14, what is the pOH?

a)

0

b)

14

c)

7

d)

3

160.

If the pOH of a solution is 2, what is the pH?

a)

12

b)

2

c)

14

d)

7

161.

If the pH of a solution is 4, what is the pOH?

a)

10

b)

2

c)

14

d)

7

162.

Reacts with metals

a)

acid

b)

base

c)

both acid and base

163.

Has a pH more than 7

a)

acid

b)

base

c)

both an acid and a base

164.

Tastes bitter

a)

acid

b)

base

c)

both an acid and a base

165.
If the pH of a solution is 7 the solution is said to be
a)
Acidic
b)
Basic
c)
Neutral
d)
Tasty
166.

Zn(OH)2 is an example of a...

a)

acid

b)

base

c)

salt

d)

water

167.

H3PO4 is an example of a ...

a)

acid

b)

base

c)

salt

d)

non-electrolyte

168.

When the polyatomic ion in an acid ends in -ite, the root name of the polyatomic ion is followed the ending -_____.

a)

ide

b)

ic

c)

ous

d)

ite

169.

What kind of compound produces a hydrogen ion when dissolved in water?

a)

ionic compound

b)

covalent compound

c)

acid

d)

base

170.

When an acid and base has been neutralized the pH will be?

a)

1

b)

4

c)

7

d)

10

171.

Which of these solutions would be considered acidic?

a)

A

b)

B

172.

What is the pH of Solution A?

a)

10

b)

9.6

c)

3.5

d)

4

173.

What is the pH of Solution B?

a)

10

b)

9.6

c)

3.5

d)

4

174.

Which of these will have the higher hydrogen ion concentration?

a)

A

b)

B

175.

What is the concentration of hydrogen ions in solution A?

a)

1.3 x 10-9 M

b)

7.9 x 10-6 M

c)

4.2 x 10-6 M

d)

6.4 x 10-7 M

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