Student Exploration: pH Analysis Vocabulary: acid; acidic, alkaline, base. indicator; neulral; pH Prior Knowledge Questions (Do these BEFORE using the Gizmo. Acids are subslances Ihal produce hydrogen ions (H ) when dissolved water: Lemon juice an examiple ol an acid: What does lemon juice taste like? What does feel like Iemon juice gets in your eye? Bases are substances that produce hydroxide ions (OH;) when dissolved water: Hand soap example of base What does soap feel like? What does soap taste like? What does feel Iike soap gels in your eye? Gizmo Warm-up The strength of an acid or base measured on the pH scale. The term "pH" is short for "potential of hydrogen measure of how many excess H' ions there are in solution: The pH scale runs from 0 t0 14, with representing the highest concentration of hydrogen ions Acidic substances have pH below while alkaline substances bases) have pH above Pure water has pH of - and Is considered neutral: The pH Analysis Gizmo allows you t0 find Ihe pH ol a variety of liquids. In Ihe Gizmo, check Ihat the Substance in the tube is Ammonia, and click Test Wait until the aimation finished_ Indicators change color in acids bases, What the color of the pH paper? Compare the paper to the PH color chart What the pH of ammonia? Is ammonia acidic or alkaline?