1. Strength of Acids and Bases
pH Worksheet
Strength of Acids and Bases

2. 1. Is pure water an acidic, basic or neutral substance?

3. 2. How does the pH of a strong acid compare with the pH of a weak base?
It is a lower number and has less H+ ions
Strong acids are 1-3
Weak acids are 3-5

4. 3. How does the pH of a strong base compare with the pH of a weak base?
It is a lower number and has less OH ions
Strong bases are 1-3
Weak bases are 3-5

5. 4. How does the pH of an acid compare with the pH of a base?
Acids have more H+ ions
Acids are 1-6.9
Bases are 7.1 to 14

6. 5. Two water molecules can react to form _______________.
Ions
The ions in water are H+ and OH-

7. 6. Why is water neutral despite the production of H+ and OH- ions.
B/c the positive ions H+ and the negative ions OH- are equal in number.

8. 7. What does the pH scale indicate?
The concentration of H+ ions in a solution.

9. Increasing acidity
Increasingly basic

11. 12. What are buffers?
Weak acids or bases that react with strong acids or bases to prevent a sudden change in pH.
Think acid reflux fixed by Tums.