Lemon juice and coffee are both acidic solutions. Lemon juice has a pH of 2, and coffee has a pH of 5. Which of these solutions is the stronger acid and why?

Question

A
Lemon juice is the stronger acid, because of the lower pH number and higher concentration of H+.

B
Coffee is the stronger acid, because of the higher pH number and higher concentration of H+.

C
Lemon juice is the weaker acid, because of the lower pH and higher concentration of OH-.

D
Coffee is the weaker acid, because of the lower pH number and higher concentration of OH-.

Answer 1

A
Lemon juice is the stronger acid, because of the lower pH number and higher concentration of H+. The lower the pH number, the higher the concentration of hydrogen ions (H+), making a solution more acidic. Lemon juice's pH of 2 indicates a higher concentration of H+ compared to coffee's pH of 5.