pH scale

Which substance is more acidic than lemon juice?

• Hydrochloric acid

• Vinegar

• Baking soda

• Milk

What is a buffer solution?

• A solution that resists changes in pH when small amounts of acid or base are added.

• A solution that changes color when exposed to air.

• A solution that can only dissolve salts.

• A solution that has a fixed pH regardless of added substances.

On the pH scale, an acid produces a solution with a pH __________ 7.

• greater than 7

• equal to 7

• less than 7

• approximately 7

What is the effect of adding a base to a solution?

• It increases the concentration of H+ ions.

• It decreases the concentration of H+ ions.

• It has no effect on the concentration of H+ ions.

• It increases the pH of the solution.

What happens to the pH when an acid is diluted with water?

• The pH decreases (becomes more acidic).

• The pH remains the same.

• The pH increases (becomes less acidic).

• The pH fluctuates randomly.

What is the pH of pure water?

• 5 (acidic)

• 7 (neutral)

• 9 (alkaline)

• 6 (slightly acidic)

What happens to the pH when a base is diluted with water?

• The pH increases (becomes more basic).

• The pH remains the same.

• The pH decreases (becomes less basic).

• The pH fluctuates randomly.

What is the effect of adding an acid to a solution?

• It increases the concentration of H+ ions.

• It decreases the pH of the solution.

• It neutralizes the solution completely.

• It increases the concentration of OH- ions.

On the pH scale, a base produces a solution with a pH __________ 7.

• less than 7

• equal to 7

• greater than 7

• none of the above

What is the pH scale range?

• 0-10

• 0-14

• 1-14

• 0-7