Understanding pH and Its Importance

What does the pH scale measure?

• The density of a solution

• The concentration of free hydrogen ions

• The concentration of hydroxide ions

• The temperature of a solution

How does the pH scale indicate the strength of an acid?

• Higher pH numbers indicate stronger acids

• Lower pH numbers indicate stronger acids

• pH numbers indicate the color of the acid

• pH numbers do not relate to acid strength

If coffee has a pH of 5, how does its acidity compare to water?

• It is 10 times less acidic than water

• It is 10 times more acidic than water

• It is 100 times more acidic than water

• It is 100 times less acidic than water

What is the role of buffers in the human body?

• To increase the acidity of blood

• To neutralize acids and bases to maintain pH balance

• To decrease the pH of all body fluids

• To increase the pH of all body fluids

What pH range is necessary for proper biological function in the human body?

• 4.5 to 5.5

• 6.5 to 7.5

• 5.5 to 6.5

• 7.5 to 8.5