Bases taste bitter rather than sour. Examples of bitter tastes are soap and quinine. Broccoli and kale taste bitter to some people depending on their taste receptors. The ability to detect bitter tastes varies from person to person.
Acids taste sour. Lemon juice and vinegar are examples of acids. Most fruits and fruit juices are acidic. The sour taste of yogurt and sour cream comes from lactic acid, produced when milk ferments.
Acids and bases that occur naturally in food are usually only slightly basic or acidic. It's not a good idea to taste non-food acids or bases as they are often caustic and can cause injury.
Here are some other properties that distinguish acids and bases:
Bases feel slippery
Acids react with metals
Bases turn red litmus blue and acids turn blue litmus red. Litmus is an acid-base indicator that's usually in the form of paper test strips.