Which statement correctly describes a pH value of 4.5?

Which statement correctly describes a pH value of 4.5?

• A. Very alkaline
• B. Neutral
• C. Very acidic
• D. Slightly basic

Answer: (C)

A pH value shows how acidic or basic a solution is, with 7 being neutral. Values below 7 indicate acidity, and the lower the number, the stronger the acidity. A pH of 4.5 is well below neutral, so it describes an acidic condition. Because pH is logarithmic, 4.5 corresponds to about 316 times more hydrogen ions than neutral water (10^-4.5 vs 10^-7), reinforcing that it’s strongly acidic. Among the given statements, describing it as very acidic is the best match for this level on the scale.

A pH value shows how acidic or basic a solution is, with 7 being neutral. Values below 7 indicate acidity, and the lower the number, the stronger the acidity. A pH of 4.5 is well below neutral, so it describes an acidic condition. Because pH is logarithmic, 4.5 corresponds to about 316 times more hydrogen ions than neutral water (10^-4.5 vs 10^-7), reinforcing that it’s strongly acidic. Among the given statements, describing it as very acidic is the best match for this level on the scale.