ph

What does a higher number on the pH scale indicate?

• A higher number on the pH scale indicates a base.

• A higher number on the pH scale indicates an acid.

• A higher number on the pH scale indicates neutrality.

• A higher number on the pH scale indicates a salt.

What is the pH range for acids?

• 0 to 3

• 4 to 6

• 0 to 6

• 7 to 14

What is a buffer?

• A substance that helps maintain a stable pH in a solution.

• A type of acid that increases the acidity of a solution.

• A chemical that changes color in response to pH changes.

• A solution that can conduct electricity.

What is the pH of a neutral substance?

• 5

• 6

• 7

• 8

What is the significance of pH in biology?

• pH is crucial in biological systems as it affects enzyme activity and chemical reactions.

• pH has no effect on biological processes.

• pH only affects the color of biological samples.

• pH is only important in plant biology.

What is an acid in terms of pH?

• A substance with a pH of 7

• A substance with a pH greater than 7

• A substance with a pH less than 7

• A neutral substance with a pH of 7

What substance has a pH of 12?

• Vinegar

• Bleach

• Water

• Milk

What is the relationship between H+ and OH- concentrations in a base?

• In a base, the concentration of H+ is greater than the concentration of OH-.

• In a base, the concentrations of H+ and OH- are equal.

• In a base, the concentration of OH- is greater than the concentration of H+.

• In a base, the concentration of H+ is less than the concentration of OH-.

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

• It decreases the concentration of H+ ions.

• It increases the concentration of H+ ions.

• It neutralizes the solution completely.

• It has no effect on the solution.

What substance has a pH of 9?

• Baking soda

• Vinegar

• Lemon juice

• Hydrochloric acid