WorksheetsCA 2.4 Acids & Bases Review
Total questions: 45
Worksheet time: 23mins
Acids react with
water to produce bases and salts
salts to produce bases and water
neither bases, salts, or water
bases to produce salts and water
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 this substance be classified?
Acid
Base
Enzyme
Fatty acid
HF could be classified as...
An acid, because it contains Hydrogen and will form H+ ions when dissolved in water.
A base, because it contains Hydroxide and will form OH- ions when dissolved in water.
A salt
An ionic compound
HNO2 would be classified as...
A base
An acid
A salt
An ionic compound
This type of solution releases Hydrogen ions into an aqueous (water-based) solution
A base
An acid
A salt
An ionic compound
KOH can be classified as...
An acid, because it contains Hydrogen and will form H+ ions when dissolved in water.
A base, because it contains Hydroxide molecules and will form OH- ions when dissolved in water.
A salt
An ionic compound
The pH of a solution is 2. This solution would be considered...
A strong base
A weak base
A strong acid
A weak acid
Which of the following statements is TRUE?
Blue litmus paper turns red when dipped in a base.
Blue litmus paper stays blue when dipped in an acid.
Red litmus paper turns blue when dipped in a base.
Red litmus paper stays red when dipped in an acid.
Which of these pH values BEST represents an acid?
10
8
12
4
Milk is a very weak acid. What might its pH value be?
4.2
12.2
6.5
7.8
When acids react with metals, they produce hydrogen gas, allowing them to dissolve metals.
True
False
When an acid is dissolved in water, it turns red litmus paper blue.
True
False
Which of the following are properties of acids?
They conduct electricity when dissolved in water.
They taste sour.
They react with metals to produce hydrogen gas.
All of the above.
Which of the following is an acid?
Bleach
Sugar in water
Vinegar
Toothpaste
A base is a solution that contains _________ ions when dissolved in water.
positive
negative
An acid is a solution that contains __________ ions when dissolved in water.
positive
negative
The pH value of an acid represents its __________ of positive H+ ions in the solution.
amount
concentration
color
charge
Which of the following is a property of a base?
A) Bitter taste
B) Slippery to the touch
C) Salty
D) Both A and B
Bases have many uses, but they are mainly used to make _________.
cleaning products
soaps
antacids
all of the above
The higher the concentration of negative (OH-) ions in a solution, the stronger the base is.
True
False
Bases tend to have a sour taste.
True
False
Which of the following pH values BEST represents a base?
2.1
4.6
6.8
8.1
The strongest bases have pH values close to
0
14
7
5
Which of the following is a base?
Baking soda in water
Orange Juice
Vinegar
Milk
Ocean water is a weak base. What might its pH value be?
5
7.8
12
2
Bases turn blue litmus paper red.
True
False
What is most likely the pH of a substance that is classified as neutral?
3
11
7.5
7
What methods can you use to measure the pH of a solution?
Observing color or clarity.
Measuring mass or volume.
Measuring density or electrical conductivity.
Using acid-base indicators or pH meters.
Which of the following is most likely to be basic?
Lemon juice
Laundry detergent
Vinegar
Coca-Cola
Why are bases useful as cleaning products?
They dissolve fats and oils.
They are corrosive, so they eat away at many materials.
They don't mix with water.
Since bases are slippery, they slip dirt off of surfaces.
Human blood has a pH between 7.35 and 7.45. Which of the following BEST describes human blood?
Strongly acidic
Slightly acidic
Strongly basic
Slightly basic
Acids are _________, which means they "eat away" at other materials.
transition metals
alkaline
corrosive
flammable
When you place blue litmus paper into an unknown clear solution, the blue litmus paper turns red.
Which of the following represents the most logical conclusion?
The substance has a pH value of 2.
The substance has a pH value of 7.
The substance is a base.
The substance is acidic.
Which substances conduct electricity?
Only acids conduct electricity because of the ions formed when dissolved in water.
Only bases conduct electricity because of the ions formed when dissolved in water.
Both acids and bases conduct electricity because of the ions formed when dissolved in water.
Neither conduct electricity.
Ammonia has a pH of 12. Ammonia would be considered a(n) _______.
Acid
Base
Element
Metal
Explain what happens when a strong acid and a strong base are poured into the same container.
They form separate layers
They mix physically but not chemically
They break apart into separate elements
They react chemically to form a salt through a neutralization reaction
Which of the following solutions could be classified as an acid?
Dish soap, pH = 12
Tomato soup, pH = 4
Baking soda, pH = 9
Drain cleaner, pH = 14
What does the pH scale measure?
The acidity or alkalinity of various substances
The malleability of a metal
The amount of phosphorus in a compound
Which of the following is TRUE about acids?
The lower the pH, the stronger the acid.
The higher the pH, the stronger the acid.
The lower the pH, the more neutral the acid.
The higher the pH, the weaker the base.
Which of the following is TRUE about bases?
The lower the pH, the stronger the base.
The higher the pH, the stronger the base.
The lower the pH, the weaker the acid.
The higher the pH, the weaker the base.
What happens when acids and bases are mixed together?
The acids become stronger.
The bases become stronger.
Nothing happens.
They neutralize each other.
Jade collected a rain sample and measured its pH to be about 5.6. What does this mean?
The rainwater is a weak base.
The rainwater is neutral.
The rainwater is a weak acid.
The rainwater is a strong acid.
How will an increase in the number of hydrogen ions in a solution affect the pH?
It will lower the pH.
It will raise the pH.
It neutralizes the solution.
Nothing will change.
A lower number of OH- ions in a solution indicates that
the solution is a strong base.
the solution is a strong acid.
the solution is a weak base.
the solution is a weak acid.
Plants such as corn grow best in soil with a pH between 4 and 6. What does this tell us about the acidity or alkalinity of the soil this plant prefers?
The plant prefers acidic soil
The plant prefers alkaline soil
The plant prefers salty soil
The plant prefers neutral soil
