A substance with pH below 7 is called what?

A substance with pH below 7 is called what?

• A. Base
• B. Heat capacity
• C. Δt
• D. Acid

Answer: (D)

On the pH scale, a substance with a pH below 7 is called an acid. The scale runs from 0 to 14, with 7 being neutral; lower numbers mean higher acidity and greater hydrogen ion concentration. Acids donate H+ in solution, which lowers the pH, while bases have pH above 7 and often involve many OH− ions. For context, citric acid in lemons or stomach acid are examples of acidic solutions. The other terms don’t describe acidity: heat capacity relates to how much heat a substance can store, and Δt denotes a change in time or temperature. A base, by contrast, has a pH above 7.

On the pH scale, a substance with a pH below 7 is called an acid. The scale runs from 0 to 14, with 7 being neutral; lower numbers mean higher acidity and greater hydrogen ion concentration. Acids donate H+ in solution, which lowers the pH, while bases have pH above 7 and often involve many OH− ions. For context, citric acid in lemons or stomach acid are examples of acidic solutions. The other terms don’t describe acidity: heat capacity relates to how much heat a substance can store, and Δt denotes a change in time or temperature. A base, by contrast, has a pH above 7.