Science: pH Scale and Acids and Bases

A solution has a pH of 3. Classify it as acidic, basic, or neutral, and explain how you know.

A substance has a pH of 7. What does this tell you about the substance?

A cleaning solution has a pH of 11. Is it an acid or a base? Explain your answer.

Compare a solution with pH 4 to a solution with pH 6. Which one is more acidic, and by how much in terms of hydrogen ion concentration?

If a sample changes from pH 8 to pH 5, did it become more acidic or more basic? Explain the change.

Litmus paper turns red in one solution and blue in another. What can you conclude about each solution?

A student says that a solution with pH 2 is only slightly more acidic than a solution with pH 3. Is the student correct? Explain.

Why is the pH scale considered logarithmic rather than linear?

A sample of rainwater has a pH of 5.6. Is this sample acidic, basic, or neutral? Explain.

If one solution has a pH of 9 and another has a pH of 12, which solution is more basic, and how much lower is its hydrogen ion concentration?

Describe what happens in a neutralization reaction between an acid and a base.

A student mixes equal amounts of a strong acid and pure water. How will the pH likely change, and why?

Household ammonia is a base. Predict whether its pH is more likely to be 2, 7, or 11, and explain your choice.

Explain why a substance with pH 1 can be dangerous to skin and materials.