Name________________________ Date_________________________ Per._________________________ Acid Base Indicators Lab Objective- To determine the pH of various household items using several indicators. Materials- Test plate Indicators Litmus paper blue Litmus paper red pH Paper Bromocresol Green Bromothymol Blue Test Solutions Diet Coke Vinegar Bleach Water Simple Green Windex Procedure1. Wear safety goggles at all times. (Acids and Base can be harmful if not handled properly). 2. Clean and dry test plate. 3. Pick a lab station. 4. Add 3 – 4 drops of the test solution to 5 separate wells of the test plate. 5. Dip the each paper indicator into a different well of the solution. Observe and note the color changes on the data table on p.2. 6. For liquid indicators add about 2 drops to each test well. Observe and note the color changes on the data table on p.2. 7. Rinse out and dry the test plate. 8. Move to the next station when instructed by your teacher. 9. Repeat steps 4 - 8 for each test solution. 10. Complete Data Table 1: Color Change on the next page. 1 Name________________________ Date_________________________ Per._________________________ Data Table 1: Color Change pH Indicator Diet Coke Windex Vinegar Drano Simple Green Water Blue Litmus Paper Red Litmus Paper Bromocresol Green Bromothymol Blue pH Paper Indicator Behavior Indicator Blue Litmus Paper Red Litmus Paper Bromocresol Green Bromothymol Blue pH Paper Indicator Behavior Turns red in an acidic solution, stays the same in a neutral solution Turns blue in a basic solution, stays the same in a neutral solution pH 0 – pH3.8 = yellow, pH 3.9 – pH 5.3 = green, pH 5.4 – pH 14 = blue pH 0 – pH 6 = yellow, pH 6.1 – pH 7.6 = green, pH 7.7 – pH 14 = blue compare to the pH chart Data Table 2: Test Solution Acidity pH Indicator Diet Coke Windex Vinegar Drano Blue Litmus Paper Red Litmus Paper Bromocresol Green Bromothymol Blue pH Paper 2 Simple Green Water Name________________________ Date_________________________ Per._________________________ Analysis: 1. What does an acid release in solution? 2. What does a base release in solution? 3. Which test solution(s) are acidic? 4. Which test solution(s) are basic? 5. Which test solution(s) are neutral? 6. Are any test solutions strong acids? Which one(s)? 7. Are any solutions strong bases? Which one(s)? 8. How could you neutralize an acid? 9. How could you neutralize a base? 10. How is water both an acid and a base? 3
