Which is NOT a characteristic of bases?

Bases are substances that exhibit specific characteristics in their chemical properties, one of which is their ability to interact with acids. The correct answer is that bases do not taste sour; instead, they tend to have a bitter taste. This mischaracterization of bases can often lead to confusion.

When discussing bases, one important property is their reaction with litmus paper, where they turn it blue, indicating their basic nature. Additionally, bases typically feel slippery to the touch due to their saponification qualities, which is why they are often used in soaps. The ability to neutralize acids and form water and a salt is also a defining feature of bases, showcasing their role in chemical reactions.

In summary, the only option that does not align with the properties of bases is the one suggesting they taste sour, as that characteristic is associated with acids instead.