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Indicators & pH scale

Total questions: 30

Worksheet time: 16mins

Name
Class
Date
1.

Which pH could belong to a strong acid?

a)

14

b)

8

c)

5

d)

1

2.

Which pH could belong to a strong alkali?

a)

14

b)

8

c)

5

d)

1

3.

Which pH could belong to a weak acid?

a)

14

b)

8

c)

5

d)

1

4.

Which pH could belong to a weak alkali?

a)

14

b)

8

c)

5

d)

1

5.

Which pH is neutral?

a)

14

b)

7

c)

4

d)

2

6.

What is an indicator in Chemistry?

a)

Chemical dyes that can change colour according to pH

b)

A small light bulb on a car

c)

A chemical involved in a chemical reaction

d)

A substance used to neutralise an acid

7.

How can you measure the pH of a substance?

a)

Use a pH probe

b)

Use universal indicator

c)

Use litmus paper

d)

Use phenolphthalein

8.

What is a pH scale?

a)

A ranking of solutions based on whether they're an acid or base

b)

A scale from 0-100

c)

A measure of the mass of metal in a substance

d)

A ranking of solutions based on whether they're a metal

9.

This is the pH scale of which indicator?

a)

Methyl orange

b)

Universal indicator

c)

Litmus solution

d)

Red cabbage indicator

10.

Bleach is a

a)

Weak base

b)

Strong base

c)

Strong acid

d)

Weak acid

11.

Orange juice is a

a)

Weak base

b)

Strong base

c)

Strong acid

d)

Weak acid

12.

Battery acid is a

a)

Weak base

b)

Strong base

c)

Strong acid

d)

Weak acid

13.

If you placed universal indicator in a test tube of sodium hydroxide, what colour would you expect the solution to be?

a)

Purple

b)

Green

c)

Yellow

d)

Red

14.
The pH of a strong acid would be:
a)
1-2
b)
5-6
c)
8-9
d)
12-13
15.
The pH of a strong base would be:
a)
1-2
b)
5-6
c)
8-9
d)
13-14
16.
According to the image, the substance tested is a...
a)
Acid
b)
Base
c)
Neutral
d)
Strong Acid
17.
Examine the results (color change) 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
18.
One drawback of pH paper is that it
a)
Only tells you if a substance is an acid or a base
b)
is very expensive
c)
has to be connected to a computer
d)
is not very accurate
19.
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
20.
One benefit of a pH Meter is that it
a)
is very expensive
b)
only tells you if a substance is an acid or a base
c)
is very accurate
d)
can be made from substances you have at home
21.
What is the pH of the substance being tested?
a)
2
b)
4
c)
6
d)
8
22.
According to the pH range which substance is more acidic than lemon juice
a)
Hydrochloric acid
b)
cabbage
c)
milk
23.

What does pH measure?

a)

the amount of hydrogen (H+) ions

b)

the amount of hydroxide (OH-) ions

c)

amount of water

d)

all of the above

24.

Which of the following represent a neutral solution?

a)

Clorox

b)

Tap water

c)

Pure water

d)

Ketchup

25.

When a solution is neutral, the concentration of H+ ions

a)

is greater than the concentration of OH- ions

b)

is less than the concentration of OH- ions

c)

is equal to the concentration of OH- ions

26.

A student added purple cabbage juice to a small amount of liquid cleaner and it turned greenish-yellow. What is the likely pH of that liquid cleaner?

a)

pH6

b)

pH 13

c)

pH 14

d)

You cannot tell pH using cabbage juice

27.

If cabbage juice was added to an unknown liquid and it turned pink, which statement would you know is true?

a)

the unknown liquid is a base

b)

the unknown liquid is an acid

c)

the unknown liquid is poisonous

d)

the unknown liquid is has a neutral pH

28.

Which of the following will NOT be a good indicator?

a)

red cabbage

b)

beet root

c)

onion

d)

lemon

29.

The most accurate way of measuring pH is

a)

universal indicator

b)

litmus

c)

pH meter

d)

red cabbage juice

30.

What does pH stand for?

a)

percentage of hydrogen

b)

power of hydrogen

c)

plus hydrogen

d)

performance of hydrogen

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