One property of acids is that they donate protons (H+). This is the defining characteristic of an acid according to the Brønsted-Lowry theory.

Here are some other properties of acids:

* Taste sour: This is why we use acids like citric acid in lemon juice and acetic acid in vinegar.

* Turn blue litmus paper red: Litmus paper is a pH indicator that changes color depending on the acidity or basicity of a solution.

* React with bases to form salt and water: This is called neutralization.

* Conduct electricity: Acids are electrolytes, meaning they can conduct electricity when dissolved in water.

* Corrosive: Many acids are corrosive and can damage skin and other materials.

It's important to note that these properties can vary in strength depending on the specific acid.