Acids taste sour, react with bases, and have a pH below 7. Bases taste bitter, may feel slimy, react with acids, and if soluble have a pH above 7. Acids and bases are substances that have different properties based on their pH levels and how they react with each other.

2.  A substance that tastes sour, acids reacts bases
and has a pH of less than 7.

4.  A substance that tastes bitter, may feel slimy,
reacts with acid and if soluble (alkali)has pH more
than 7.

7. What are acids? What are bases?