A solution with pH less than 7 is called what?

A solution with pH less than 7 is called what?

• A. Base
• B. Acid
• C. Catalyst
• D. Endothermic

Answer: (B)

A solution with a pH below 7 is acidic. The pH scale measures how acidic or basic (alkaline) a solution is: neutral is 7, acids fall below 7, and bases are above 7. Acids increase the concentration of hydrogen ions (H+) in water, which lowers the pH. That’s why a low pH indicates acidity. The other terms don’t describe pH: a base has a pH above 7 and often raises OH- in solution, a catalyst speeds up a reaction without defining pH, and an endothermic process refers to heat absorption rather than acidity.

A solution with a pH below 7 is acidic. The pH scale measures how acidic or basic (alkaline) a solution is: neutral is 7, acids fall below 7, and bases are above 7. Acids increase the concentration of hydrogen ions (H+) in water, which lowers the pH. That’s why a low pH indicates acidity. The other terms don’t describe pH: a base has a pH above 7 and often raises OH- in solution, a catalyst speeds up a reaction without defining pH, and an endothermic process refers to heat absorption rather than acidity.