20.9: Worksheets for Chapter 20
Copy and distribute the lesson worksheets. Ask students to complete the worksheets alone or in pairs as a review of lesson content.
pH Worksheet
CK-12 Foundation Chemistry
Name______________________ Date_________
- Calculate the of a solution with .
- Calculate the of a solution that is .
- Calculate the of a solution that is .
- What is the in a solution with ?
- What is the in a solution with ?
- of is added to enough water to make of solution. What is the ?
- A solution has a . How many liters of water must be added to change the to ?
- If you do the regular calculations to determine the pH of a solution, you will get the . You should have a feeling that something is wrong with this situation because this indicates that a solution of acid has a basic . What do you think is wrong with this calculation?
Complete the following table.
A, B, or N | ||||
---|---|---|---|---|
9. | ||||
10. | ||||
11. | 10.75 | |||
12. |
Strong Acids and Bases Worksheet
CK-12 Foundation Chemistry
Name______________________ Date_________
- If the hydrogen ion concentration in a solution is , what is the hydroxide ion concentration?
- What is the hydroxide ion concentration in a solution whose is ?
- What is the hydrogen ion concentration in a solution prepared by dissolving of in enough water to make of solution?
- How many of potassium hydroxide are required to neutralize of ?
- If of are neutralized by of , what is the molarity of the ?
- What volume of would be necessary to neutralize of ?
- of is mixed with of . What is the final and ?
- What is the of the final solution in problem 7?
- of is mixed with of . What is the final and ?
- What is the of the final solution in problem 9?
- of is mixed with of . What is the final and ?
- What is the of the final solution in problem 11?
- What is the final and in a solution made by adding of to of ?
- What is the of the final solution in problem 13?
- What is the molar mass of a solid monoprotic acid if of the acid requires of to neutralize it?
Weak Acids and Bases Worksheet
CK-12 Foundation Chemistry
Name______________________ Date_________
1. Explain the difference between the designations “strong” acid and “weak” acid.
2. The of acid A is and the of acid B is . Which acid is the stronger acid?
3. Explain what happens to the of a solution of acetic acid when a solution of sodium acetate is added to it.
4. Explain why a solution of sodium acetate will be basic.
5. What is the of a solution of a weak acid, , if the for is .
6. The of a solution of a weak acid, , is . What is the of this acid?
7. What is the of a solution of ? The for is .
8. The of a solution of the weak base methylamine is 12.3. The equation for the reaction of methylamine in water is
What is the for methylamine?
9. Will a solution of potassium acetate be acidic, basic, or neutral?
10. Will a solution of be acidic, basic, or neutral? Use as the for and as the for .
Conjugate Acids-Bases Worksheet
CK12 Foundation Chemistry
Name ________________________________ Date ______________
Conjugate Acid-Base Pairs
Acids and bases exist as conjugate acid-base pairs. The term conjugate come from the Latin meaning “joining together” and refers to things that are joined, particularly in pairs, such as Bronsted acids and bases.
Every time a Bronsted acid acts as a hydrogen ion donor, it forms a conjugate base. Imagine a generic acid, HA. When this acid donate a hydrogen to water, one product of the reaction is the A- ion, which is then capable of accepting a hydrogen ion, and is, therefore, a Bronsted base.
Conversely, every time a base gains an , the product is a Bronsted acid.
Acids and bases in the Bronsted model, therefore, exist as conjugate pairs whose formulas are related by the gain or loss of a hydrogen ion.
The use of the symbols and for the conjugate acid-base pair does not mean that all acids are neutral molecules or that all bases are negative ions. It signified only that the acid contains a hydrogen ion that is not present in the conjugate base. Bronsted acids or bases can be neutral molecules, positive ions, or negative ions.
Exercises
1. Write the formula for the conjugate base of each of the following acids.
- A. . . . conjugate base = ______
- B. . . . conjugate base = ______
- C. . . . conjugate base = ______
- D. . . . conjugate base = ______
2. Write the formula for the conjugate acid of each of the following bases.
- A. . . . conjugate acid = ______
- B. . . . conjugate acid = ______
- C. . . . conjugate acid = ______
- D. . . . conjugate acid = ______
3. For each given formula, indicate whether its conjugate partner is an acid or base and write its formula.
- A. . . . conjugate ______ = ______
- B. . . . conjugate ______ = ______
- C. . . . conjugate ______ = ______
- D. . . . conjugate ______ = ______
4. In each of the following acid-base reactions, identify the acid and base on the left and their conjugate partners on the right.
- A.
- B.
Answers to Worksheets
- The worksheet answer keys are available upon request. Please send an email to teachers-requests@ck12.org to request the worksheet answer keys.
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Answers for pH Worksheet
1. Calculate the of a solution with .
2. Calculate the of a solution that is 0.050 M .
3. Calculate the of a solution that is .
4. What is the in a solution with ?
5. What is the in a solution with ?
If , then and
6. 10.0 g of is added to enough water to make 400. mL of solution. What is the ?
7. A 1.0 liter solution has a . How many liters of water must be added to change the to 3?
At ,
If , then 1.0 liter of solution contains 0.010 mol .
At ,
Beginning with 1.0 liter and ending with 10.0 liters would require an additional 9.0 liters.
8. If you do the regular calculations to determine the of a solution, you will get the . You should have a feeling that something is wrong with this situation because this indicates that a solution of acid has a basic . What do you think is wrong with this calculation?
This is such a dilute solution of that the contribution of from the dissociation of water is the predominant source of . The of this solution will be nearly 7 because the contribution of hydrogen ion from the is not significant.
Complete the following table.
A, B, or N | ||||
---|---|---|---|---|
9. | 3.2 | A | ||
10. | 4.9 | A | ||
11. | 10.75 | B | ||
12. | 12.6 | B |
Answers for Strong Acids and Bases Worksheet
1. If the hydrogen ion concentration in a solution is , what is the hydroxide ion concentration?
2. What is the hydroxide ion concentration in a solution whose is 11?
3. What is the hydrogen ion concentration in a solution prepared by dissolving 0.400 grams of in enough water to make 2.00 liters of solution?
4. How many mL of 0.100 M potassium hydroxide are required to neutralize 75.0 mL of 0.500 M ?
At neutrality, moles of hydrogen ion are equal to moles of hydroxide ion.
5. If 50.0 mL of are neutralized by 100. mL of 0.200 M , what is the molarity of the ?
6. What volume of 6.00 M would be necessary to neutralize 400. mL of 3.00 M ?
7. 200. mL of 0.0150 M is mixed with 300. mL of 0.00100 M . What is the final and ?
8. What is the of the final solution in problem 7?
9. 700. mL of is mixed with 300. mL of . What is the final and ?
10. What is the of the final solution in problem 9?
11. 25.0 mL of 0.0100 M is mixed with 35.0 mL of 0.0300 M . What is the final and ?
12. What is the of the final solution in problem 11?
13. What is the final and in a solution made by adding 100. mL of 0.000200 M to 100. mL of 0.0000990 M ?
14. What is the of the final solution in problem 13?
15. What is the molar mass of a solid monoprotic acid if 0.300 grams of the acid requires 30.0 mL of 0.200 M to neutralize it?
Answers for Weak Acids and Bases Worksheet
- The worksheet answer keys are available upon request. Please send an email to teachers-requests@ck12.org to request the worksheet answer keys.