Acids and bases are everywhere in our lives. Our stomachs produce hydrochloric acid to help us digest food and to protect us from infectious disease. Acids are also present in many sour tasting foods. We can find bases in bleach for cleaning, among other places. People often recall the corrosive properties of acids but are unaware that bases can be just as corrosive, if not more dangerous. The pH scale measures how acidic or basic a substance, and we can determine that measurement by adding a universal indicator to it. The activities in this guide will help students understand more about the properties of acids and bases and are a perfect supplement to lab time!