Which of the following is a property of a base?*1 pointdonates hydrogen ionshas a pH less than 7turns red litmus bluetastes sour

A property of a base is that it turns red litmus blue.

Here's why:

1. Bases are substances that can accept hydrogen ions. This is the opposite of donating hydrogen ions, which is a property of acids.

2. The pH scale measures how acidic or basic a substance is. It ranges from 0 to 14. A pH of 7 is neutral. A pH less than 7 indicates an acid. Bases have a pH greater than 7.

3. Litmus paper is an indicator used to test whether a substance is acidic or basic. Red litmus paper turns blue in a base, which is a key property of bases.

4. The taste of a substance is not a reliable way to determine if it is a base or an acid, and it can be dangerous to taste unknown substances. However, generally, bases are described as bitter, not sour. Sourness is a characteristic of acids.