What properties are typically associated with acids?

The properties typically associated with acids include a sour taste and the ability to turn blue litmus paper red. This is a fundamental characteristic of acids, which stems from their ability to donate protons (H⁺ ions) in aqueous solutions. The sourness is observed in various acidic substances, such as citric acid in lemons or acetic acid in vinegar.

When an acid is dissolved in water, it increases the concentration of hydrogen ions, which can then interact with litmus paper. Blue litmus paper will change to red in the presence of an acid due to this increase in H⁺ concentration, demonstrating the acid's acidic nature.

This definition aligns well with the standard behavior of acids and illustrates why the chosen response is the correct one. In contrast, other options describe attributes that align more closely with bases or other chemical behaviors. For instance, bases are known for their bitter taste, slippery feel, and the ability to turn red litmus paper blue.