GIZMOS. pH Analysis: Quad Color Indicator,

Document Content and Description Below

pH Analysis: Quad Color Indicator Gizmo Warm-up The strength of an acid or base is measured on the pH scale. The term “pH” is short for “potential of hydrogen.” It is a measure of how many... excess H+ ions there are in a solution. The pH scale runs from 0 to 14, with 0 representing the highest concentration of hydrogen ions. Acidic substances have a pH below 7, while alkaline substances (bases) have a pH above 7. Pure water has a pH of 7 and is considered neutral. The pH Analysis: Quad Color Indicator Gizmo™ allows you to find the pH of a variety of liquids. In the Gizmo, check that the Substance in the tube is Ammonia, and click Test. 1. Indicators change color in acids or bases. What are the colors of the pH paper? < Red-Orange or yellow-Green-Blue-Violet or Indigo > 2. Compare the paper to the pH color chart. What is the pH of ammonia? < > Is ammonia acidic or alkaline? < Acidic > Activity A: Measuring pH Get the Gizmo ready:  Click Reset.  Check that the 0-14 paper is selected. Goal: Find the pH of 18 common substances. 1. Test: Use the Gizmo to find the pH of each of the available substances. Classify each substance as acidic (pH < 7), alkaline (ph > 7), or neutral (pH = 7). 0-14 pH indicator paper Material in the tube pH value Acidic, alkaline, or neutral? Baking soda 8 Alkaline Bleach 11 Alkaline Coffee 5 Acidic Cola 2 Acidic Drain cleaner 13 Alkaline Hand soap 9 Alkaline Juice (lemon) 2 Acidic [Show More]

Last updated: 1 year ago

Preview 1 out of 3 pages