Which of the following is NOT a property of acids?

Acids are characterized by several specific properties, and the correct answer highlights one of the key differences between acids and bases. Acids typically have a low pH, usually below 7, which indicates their acidic nature. This low pH is a fundamental property of acids, as it reflects their ability to donate protons (H+) in a solution.

On the other hand, the other properties associated with acids include their sour taste, their ability to react with bases to neutralize them, and the fact that they can produce hydrogen gas when they react with certain metals. The misconception that acids might have a high pH arises from confusion with bases, which indeed have a high pH. Understanding pH levels is crucial in distinguishing between different types of substances in chemistry.