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Worksheets'24: Norman: 8th: Acids & Bases (pH)
Total questions: 21
Worksheet time: 1hrs 3mins
What is an acid?
a. Substances that break apart in water to form a hydrogen ion (H+). They have a sour taste, react with metals and carbonates, and turns blue litmus paper red
a. Substances that break apart in water to form a hydroxide ion (OH-). They have bitter taste, slippery feel, react with other bases and acids, and turns red litmus paper blue
What is a base?
a. Substances that break apart in water to form a hydrogen ion (H+). They have a sour taste, react with metals and carbonates, and turns blue litmus paper red
a. Substances that break apart in water to form a hydroxide ion (OH-). They have bitter taste, slippery feel, react with other bases and acids, and turns red litmus paper blue
An example of a base is:
lemon juice
tomato
soap
hydrochloric acid
An example of an acid is:
soap
Baking soda
Lemond juice
Drain cleaner
A range of values from 0-14 that expresses the concentration of hydrogen ions in a solution is called:
Neutralization
Acid rain
pH scale
Ion scale
A reaction between an acid and base result in a solution that is neither acidic or basic. This is called:
neutralization
salt
balancing scale
concentration
A lemon has a low pH level and has a pH level of around 2. Is the lemon an acid, base or neutral?
Acid
Base
Neutral
Ammonia has a high pH level between 11 and 12. Is the ammonia an acid, base or neutral?
Acid
Base
Neutral
Baking soda has a pH level around 9. Is baking soda an acid, base or neutral?
Acid
Base
Neutral
Tomatoes have a pH level between 4 and 4.5. Are tomatoes an acid, base or neutral?
Acid
Base
Neutral
Pure water has a pH of 7. Is pure water an acid, base or neutral?
Acid
Base
Neutral
Milk is a neutral substance. Around what pH level would you place milk?
2
11
7
The table shown in the picture lists four substances along with their pH levels. Which substance is the LEAST acidic?
Stomach juice
Acid rain
Pure rainwater
Cola
The table shown in the picture lists four substances along with their pH levels. Which substance is the MOST acidic?
Stomach juice
Acid rain
Pure rainwater
Cola
The table shown in the picture lists four substances along with their pH levels. Which substance is the LEAST basic?
Hand soap
Blood
Drain cleaner
Baking soda
The table shown in the picture lists four substances along with their pH levels. Which substance is the MOST basic?
Hand Soap
Blood
Drain cleaner
Baking soda
The greater the concentration of hydroxide ions (OH-) the _________________ the base.
Stronger
Weaker
The greater the concentration of H+ hydrogen ions (H+) the _________________ the acid.
Stronger
Weaker
TRUE OR FALSE: On the pH scale, the farther away from 7 you go the STRONGER the acid or base.
TRUE
FALSE
Ocean water is only slightly basic. What might its pH value be?
5
8
12
2
Benjamin, Avery, and Hannah are conducting a science experiment in their school lab. They are using bleach, which is a strong base. Can you tell them what the pH level of bleach is?
13
7
8
2
