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Worksheets

.5 Acids and Bases 2026

Total questions: 131

Worksheet time: 5hrs 21mins

Name
Class
Date
1.

Which pH value indicates the most basic solution?

a)

7

b)

8

c)

3

d)

11

2.

Which is the most likely pH for a solution of a weak acid?

a)

1

b)

5

c)

11

d)

14

3.

When the pH of a solution becomes more basic, the number on the pH scale

a)

decreases

b)

increases

c)

stays the same

d)

triples

4.

What base has a pH of 8.5?

a)

Blood

b)

Soap

c)

Baking Soda

d)

Drain Cleaner

5.

In a water solution, how do acids differ from bases?

a)

Acids form salts, but bases do not

b)

Acids turn litmus blue, while bases turn litmus red

c)

Acids form hydrogen ions (H+), while bases form hydroxide ions (OH-)

d)

Bases form salts, but acids do not

6.
If a substance has a pH of 10 it is considered
a)
Acidic
b)
Basic
c)
Neutral
7.
Acids produce _________ ions when they break down or dissocciate. 
a)
Hydroxide (OH-)
b)
Water
c)
Chlorine (Cl-)
d)
Hydrogen (H+)
8.
Bases release ____________ ions when they break down or dissociate. 
a)
Hydrogen (H+)
b)
Hydroxide (OH-)
c)
Chlorine (Cl-)
d)
no
9.
Water is neutral because the number of hydrogen and hydroxide ions is _________.
a)
the same
b)
different
10.
A(n) ______ is a substance with a pH less than 7
a)
Acid
b)
Alkaline
c)
Base
d)
Buffer
11.
A(n) _______ is a substance with a pH greater than 7.
a)
Base
b)
Acid
c)
Buffer
d)
Water
12.

Acid changes the color of litmus paper from

a)

blue to red

b)

red to blue

c)

Orange to greem

13.

WHAT ARE THE PROPERTIES OF ACID ?

a)

Acids are corrosive, sour,

b)

Lemon

c)

Mint

d)

tastes bitter

14.

How do acids taste compared to bases?

a)

Acid is sweet and base is sour

b)

Acid is bitter and base is sour

c)

Acid is sour and base is bitter

15.
Soap is a weak base.  What is true about the taste of bases?
a)
they taste sour
b)
they taste sweet
c)
they taste bitter
d)
they taste salty
16.

Human blood has a pH of between 7.38 and 7.42. This means that the blood is ________.

a)

very acidic

b)

slightly acidic

c)

very basic

d)

slightly basic

17.
Feels slippery.
a)
Acids
b)
Bases
c)
All
18.

A substance is found to have the following characteristics:


Very bitter taste

Feels slippery to the touch

Produces OH- ions when dissolved in water


In what category would the substance be classified?

a)

acid

b)

base

c)

enzyme

d)

fatty acid

19.

Which of the following is an acid?

a)

shampoo

b)

baking soda

c)

orange juice

d)

water

20.
is this object acidic or base
a)
Acidic
b)
Base
c)
neither
d)
neutral 
21.
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)
22.

Do acids and bases conduct electricity?

a)

Only acids conduct electricity

b)

Only bases conduct electricity

c)

Bases and acids conduct electricity

d)

Neither conduct electricity

23.

What completely ionizes in solution?

a)

Weak acids

b)

Strong acids

c)

Strong Salts

d)

Neutral salts

24.

If a solution has a very low pH, the hydroxide concentration is _______.

a)

very high

b)

very low

c)

zero

25.

If a solution has a very high pH, the hydroxide concentration is _______.

a)

very high

b)

very low

c)

zero

26.

If a solution has a very high hydrogen ion concentration, the hydroxide concentration is _______.

a)

very high

b)

very low

c)

zero

27.
Which solution releases H+ in solution?
a)
Base
b)
Acid
c)
Buffer
d)
Water
28.
This substance releases OH- into solution
a)
Acid
b)
Base
c)
Neutral
29.
A solution with a pH of 3.6 would be...
a)
Acid
b)
Base
c)
Neutral
d)
Acid and Base
30.
A solution with a pH of 8.6 would be...
a)
Acid
b)
Base
c)
Neutral
d)
Acid and Base
31.
According to the pH range which substance is more acidic than lemon juice
a)
Hydrochloric acid
b)
cabbage
c)
milk
32.

The table shows the pH of several solutions. Which solution has the greatest concentration (amount) of H+ ions?

a)

vinegar

b)

milk

c)

water

d)

bleach

33.

Match the following

a)

higher than 7

1.

base

b)

lower than 7

2.

acid

c)

7

3.

neutral

34.

Match these

a)

strongly acidic

1.

3.3 mountain dew

b)

slightly acidic

2.

6.7 milk

c)

strongly basic (alkaline)

3.

13 ammonia

d)

slightly basic (alkaline)

4.

7.35 human blood

35.

The table shows the pH of several solutions. Which solution has the greatest concentration (amount) of OH- ions?

a)

vinegar

b)

milk

c)

water

d)

bleach

36.

Bases, also known as ​ (a)   will turn litmus paper ​ (b)   . This is because they have a pH ​ (c)   . They taste ​ (d)   .

Choose from the below words
alkali and OH-
blue
above 7
bitter
below 7
H+
red
sour
37.

Acids, also known as ​ (a)   , will turn litmus paper ​ (b)   . This is because they have a pH ​ (c)   . They taste ​ (d)   .

Choose from the below words
H+
red
below 7
sour
bitter
above 7
blue
38.
Examine the results (blue) of the pH paper shown in the picture.  What type of substance was tested?
a)
an acid
b)
a base
c)
a neutral substance
d)
none of the above
39.
Which of the following is an acid?
a)
Ammonia
b)
Drain cleaner
c)
Shampoo
d)
Orange
40.
This piece of pH paper has been dipped into:
a)
An acid
b)
A base
c)
A pH-neutral substance
d)
A buffer
41.
Litmus paper is an indicator of acids and bases, it turns red for bases.
a)
True
b)
false
42.
Bases will turn litmus paper __________, while acids will turn litmus paper __________.
a)
blue.....red
b)
red.....blue
c)
pink.........colourless
d)
colourless..........pink
43.
An indicator will ______________ when it is in contact with an acid or base
a)
Bubble
b)
Form a new substance
c)
Change color
d)
Stay the same color
44.
What color does litmus paper turn in the presence of an acid?
a)
Red
b)
Blue
45.
According to the image, the substance tested is a...
a)
Acid
b)
Neutral
c)
Strong Acid
d)
Base
46.
One drawback of litmus paper is that it
a)
Only tells you if a substance is an acid or a base
b)
is very expensive
c)
is messy
d)
has to be connected to a computer
47.
What is the pH of the substance being tested?
a)
2
b)
4
c)
6
d)
8
48.
How would you classify the substance being tested?
a)
Acid
b)
Base
c)
Both
d)
Neither
49.

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

a)

2

b)

20

c)

10

d)

100

50.
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
51.

If pure water is added to an acid with a pH of 3, what happens to the pH of the solution?

a)

the pH increases to above 3

b)

the pH decreases to below 3

c)

the pH stays the same at 3

52.

Household vinegar has a pH of approximately 3.0. Which would appear yellow when added to a vinegar solution?

a)

Methyl orange

b)

Bromcresol green

c)

Phenophthalein

d)

Litmus

53.

Phenolphthalein has a pink color in a solution that has a pH of

a)

5

b)

11

c)

1

d)

7

54.

Which indicators would cause a solution with a pH of 2 to turn red?

a)

Bromthymol blue and thymol blue

b)

Bromcresol green and litmus

c)

Litmus and methyl orange

d)

Methyl orange and phenolphthalein

55.

An indicator was used to test a water solution with a pH of 3. Which indicator color would be observed?

a)

Yellow with methyl orange

b)

Pink with phenolphthalein

c)

Blue with litmus

d)

Yellow with bromcresol green

56.

At what pH will bromthymol blue, thymol blue, and bromcresol all be yellow?

a)

4

b)

2

c)

7

d)

5

57.

What is the colour of phenolphthalein an acid?

a)

Pink

b)

Yellow

c)

Orange

d)

Colourless

58.

What is the colour of litmus in an acid ?

a)

Pink

b)

Yellow

c)

Red

d)

Colourless

59.

What is the colour of litmus in a base ?

a)

Pink

b)

Blue

c)

Red

d)

Colourless

60.

What is the colour of phenolphthalein in a base ?

a)

Pink

b)

Blue

c)

Red

d)

Colourless

61.

What is the colour of methyl orange in a base ?

a)

Pink

b)

Blue

c)

Yellow

d)

Colourless

62.

If NaOH has a pH of 12, what color will it turn in Thymol Blue?

a)

red

b)

yellow

c)

green

d)

blue

63.

The small intestine has a pH value of 7.3. What color would it turn when tested with the indicator thymol blue?

a)

red

b)

yellow

c)

blue

d)

green

64.

Which pH is the most acidic?

a)

6.7

b)

2.0

c)

8.0

d)

7.3

65.

Which indicator would turn yellow in a solution with a pH of 9.8?

a)

methyl orange

b)

bromthymol blue

c)

bromcresol green

d)

thymol blue

66.

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

67.
BASE + ACID ----> SALT +?
a)
water
b)
oxygen
c)
hydrogen ion
d)
hydroxide ion
68.
When dissolved in water, acids produce:
a)
bases
b)
salts
c)
hydrogen ions
d)
hydroxide ions
69.
Which type of ion does a base produce when it is dissolved in water?
a)
oxide
b)
oxygen
c)
hydrogen
d)
hydroxide
70.
Is HNO3 an acid or base?
a)
Acid
b)
Base
71.
KOH will release which ion?
a)
OH-
b)
H+
c)
OH+
d)
H-
72.

Predict the products of this reaction.

HCl + Ca(OH)2

a)

NaCl

b)

CaCl2

c)

CaCl2 + H2O

d)

H2O

73.

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

74.

Equal amounts of an acid and a base are mixed in a beaker. When neutralization is complete, what is in the beaker besides salt?

a)

acid only

b)

base only

c)

water

75.

Equal amounts of an acid and a base are mixed in a beaker. When neutralization is complete, what is in the beaker besides salt?

a)

acid only

b)

base only

c)

water

76.

Which salt is formed in a reaction between HBr and LiOH?

a)

LiBr

b)

BrLi

c)

NaCl

d)

NaOH

77.
What are the products to a neutralization reaction?
a)
H2 + Ionic Salt
b)
H2O + Ionic Salt
c)
H3O+ + Ionic Salt
d)
OH- + Ionic Salt
78.

Complete the following reaction:

HCl + Mg(OH)2 -->

a)

MgCl2 + H2O

b)

Mg +H2O

c)

MgCl2 + H2

d)

MgCl2 + H2O + CO2

79.
Ca(OH)2 is an example of a(n)
a)
Acid
b)
Base
c)
Neutral
80.
HBr is an example of a(n)
a)
Acid
b)
Base
c)
Neutral
81.
LiOH + HCl --> ???
What are the products in this neutralization reaction?
a)

HCl and H2O

b)

LiCl and H2O

c)

LiH and ClO

d)

LiO and HOH

82.

What are the correct products for the following reactants HCl + NaOH →

a)

HOH + CrNa

b)

NaCl + H2O

c)

H3O + NaCl2

d)

NaOH + Cl

83.

a reaction in which an acid and a base in an aqueous solution react to produce a salt and water

a)

acid base indicator

b)

neutralization reaction

c)

titration

84.
acid + base ₋>
a)
salt + hydrogen
b)
salt + water
c)
salt + carbon dioxide + water
d)
salt
85.
Name HF
a)
hydrofluoric acid
b)
Hypofluoric acid
c)
hydrogen fluorine acid
d)
fluoric acid
86.
Name the Acid: H2S
a)
Sulfuric Acid
b)
Sulfurous Acid
c)
Hydrosulfuric Acid
d)
Hydrosulfurous Acid
87.

reaction of an acid and a base to form a salt and water

a)

neutralization reaction

b)

single displacement reaction

c)

combustion reaction

d)

decomposition reaction

88.
What are the products of the neutralization shown below?
Ca(OH)2  +  H2CO3  -->  
a)
H2O  +  Ca2CO3
b)
CaO +  CO3
c)
H2O  +  CaCO3
89.
A hydrogen ion, H+, is the same as a(n):
a)
neutron
b)
electron
c)
proton
d)
hydroxide ion
90.

A Bronsted Lowry acid:

a)

donates H+ to another substance

b)

accepts H+ from another substance

c)

produces H+

d)

produces OH-

91.

A Bronsted Lowry base:

a)

donates H+ to another substance

b)

accepts H+ from another substance

c)

produces H+

d)

produces OH-

92.

NaOH is:

a)

an Arrhenius base

b)

an Arrhenius acid

c)

neither an acid nor a base

d)

both an acid and a base

93.

An Arrhenius base:

a)

donates H+

b)

accepts H+

c)

produces H+

d)

produces OH-

94.

An Arrhenius acid:

a)

donates H+ to another substance

b)

accepts H+ from another substance

c)

produces H+

d)

produces OH-

95.
A hydrogen ion, H+, is the same as a(n):
a)
neutron
b)
electron
c)
proton
d)
hydroxide ion
96.
Forms a OH- hydroxide ion
a)
Lewis Base
b)
Arrhenius Base
c)
Bronsted Lowry Base
d)
Bronsted Lowry Acid
97.

A Bronsted Lowry base:

a)

donates H+ to another substance

b)

accepts H+ from another substance

c)

produces H+

d)

produces OH-

98.

Which of the following does not describe an Arrhenius or Bronsted Lowry acid or base?

a)

Produces H+

b)

Produces OH-

c)

Donates H+ to another substance

d)

Donates OH- to another substance

99.
The Acid-Base classification system that defined acids as those that release H+ and bases as release OH- is known as ________.
a)
Bronsted-Lowry
b)
Arrhenius acid-base
c)
Lewis acid-base
d)
Monoprotic and Polyprotic Acids
100.

According to one acid base theory, the water acts as

a)

a base because it accepts an H+

b)

a base because it donates an H+

c)

an acid because it accepts an H-

d)

an acid because it donates an H-

101.

According to Bronsted-Lowry, what does an acid do?

a)

It donates a proton (H+).

b)

It accepts a proton (H+)

c)

It produces H+ in water.

d)

It produces OH- in water.

102.

According to Bronsted-Lowry, what does a base do?

a)

It donates a proton (H+).

b)

It accepts a proton (H+)

c)

It produces H+ in water.

d)

It produces OH- in water.

103.
What substances increase H+ ion concentrations when dissolved in water?
a)
Brønsted-Lowry Acids
b)
Brønsted-Lowry Bases
c)
Arrhenius Acids
d)
Arrhenius Bases
104.

What kind of compound is KOH?

a)

An acid because it starts with H+

b)

A base because it ends with OH-

c)

A salt because it contains a metal and nonmetal (or has a polyatomic ion)

d)

A molecule because it has two nonmetals

105.

What is the name of the following acid or base?
LiOH

a)

lithium hydroxide

b)

lithium hydroxic acid

c)

lithium hydroxous acid

106.

What is the name of the following acid or base?
H2S

a)

hydrosulfuric acid

b)

sulfuric acid

c)

sulfurous acid

107.

What is the name of the following acid or base?
H3P

a)

hydrophosphoric acid

b)

phosphoric acid

c)

phosphorous acid

108.

What is the name of the following acid or base?
Ca(OH)2

a)

calcium hydroxide

b)

calcium hydroxic acid

c)

calcium hydroxous acid

109.

What is the name of the following acid or base?
Mg(OH)2

a)

magnesium hydroxide

b)

magnesium hydroxic acid

c)

magnesium hydroxous acid

110.

What is the name of the following acid or base?
H2S

a)

hydrosulfuric acid

b)

sulfuric acid

c)

sulfurous acid

111.

A solution with a pH of 12 is:

a)

Neutral

b)

Acidic

c)

Basic

d)

A buffer

112.

Which of the following is not a property of acids?

a)

They turn blue litmus paper red.

b)

They have a sour taste.

c)

They feel slippery.

d)

They release hydrogen ions in solution.

113.

Which of the following solutions is likely to have the highest pH?

a)

Vinegar

b)

Distilled water

c)

Household bleach

d)

Lemon juice

114.

A solution with a pH lower than 7 is:

a)

Always a buffer solution.

b)

Considered neutral.

c)

Considered acidic.

d)

Considered basic.

115.

A solution that has a pH of 3.5 is ten times more acidic than a solution with a pH of:

a)

2.5

b)

3.0

c)

4.5

d)

5.5

116.

A solution with a pH of 2 is how many times more acidic than a solution with a pH of 5?

a)

3 times

b)

300 times

c)

1000 times

d)

3000 times

117.

Which of the following pH values represents a neutral solution?

a)

3

b)

7

c)

11

d)

14

118.

Which of the following is a characteristic of a base?

a)

It tastes sour.

b)

It turns litmus paper red.

c)

It feels slippery.

d)

It releases hydrogen ions in solution.

119.

Lemon juice is an example of  -

a)

a base

b)

an acid

c)

a neutral substance

120.

The pH scale...what numbers on the scale represent an acid?

a)

0-6

b)

7

c)

8-14

121.

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

a)

ionic compound

b)

covalent compound

c)

acid

d)

base

122.

Does the solution in the beaker represent an acid or a base?

a)

Acid

b)

Base

c)

Neither

d)

Both

123.

Does the solution in the beaker represent an acid or a base?

a)

Acid

b)

Base

c)

Neither

d)

Both

124.

A neutralization reaction will (almost) always produce...

a)

water & salt

b)

water

c)

salt

d)

water & carbon

125.

This image represents what kind of reaction?

a)

neutralization reaction

b)

synthesis

c)

decompostion

d)

single displacement

126.
A neutralization reaction will (almost) always produce...
a)
water & salt
b)
water
c)
salt
d)
water & carbon
127.

If the pH is 7 what is the [H+] ?

a)

0.0000001 = ( 1x10-7 )

b)

0.00000001 = ( 1x10-8 )

c)

0.0001 = ( 1x10-4 )

d)

0.00001 = ( 1x10-5)

128.

If the pH is 6 what is the [H+] ?

a)

0.0000001 = ( 1x10-7 )

b)

0.00000001 = ( 1x10-8 )

c)

0.0001 = ( 1x10-4 )

d)

0.000001 = ( 1x10-6)

129.

If the pH is 3 what is the [H+] ?

a)

0.0000001 = ( 1x10-7 )

b)

0.00000001 = ( 1x10-8 )

c)

0.001 = ( 1x10-3 )

d)

0.00001 = ( 1x10-6)

130.

If the pH is 13 what is the [H+] ?

a)

0.0000001 = ( 1x10-7 )

b)

0.0000000000001 = ( 1x10-13 )

c)

0.001 = ( 1x10-3 )

d)

0.00001 = ( 1x10-6)

131.

Which diagram is showing a weak acid?

a)

Left

b)

Right

c)

Neither

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