Strength of Acids and Bases pH Worksheet Strength of Acids and Bases

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

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

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

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

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

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.

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

Increasing acidity Increasingly basic

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.