Which pH value is more acidic, a pH of 3 or a pH of 7?

A pH value of 3 is considered more acidic than a pH of 7. The pH scale ranges from 0 to 14, with values below 7 indicating acidity and values above 7 indicating alkalinity. A pH of 7 is classified as neutral, which is the pH of pure water at 25°C. As the pH value decreases from 7 toward 0, the concentration of hydrogen ions (H⁺) in the solution increases, signifying a higher acidity level.

Therefore, a pH of 3 has a significantly higher concentration of hydrogen ions compared to a pH of 7, making it much more acidic. An important concept to consider is that each unit decrease in pH represents a tenfold increase in acidity. Thus, a solution with a pH of 3 is 1,000 times more acidic than one with a pH of 6, and vastly more so than neutral pH 7. Understanding this relationship is crucial in fields such as biology and chemistry, as it underscores the importance of pH in various biological processes and chemical reactions.