Household Acids and Bases Lab - COACH KRATOWICZ



810895014287500Household Acids and Bases LabMany common household solutions contain acids and bases. Acid-base indicators turn different colors in acidic and basic solutions. Thus, they indicate whether a solution is acidic or basic. The acidity of a solution can be expressed using the pH scale. Acidic solutions have pH values less than 7, basic solutions have pH values greater than 7, and neutral solutions have a pH value equal to 7. Litmus and the spice turmeric are natural indicators. In this lab you will test a variety of household products with several natural indicators and will classify each product as an acid, base, or neutral (neither acid nor base).CAUTION! Wear your goggles and handle all solutions with care. Several of these products are harmful. Ammonia is toxic and irritating to the eyes. Drain cleaner and toilet bowl cleaner are corrosive. Do not allow these solutions to touch your skin or clothing. DO NOT eat or drink in the labProcedure: Follow your teacher’s instructions for testing each solution.1. Place 3 drops of each solution in a separate well of the well plate.2. Place the red litmus indicator paper in each well of solution. DO NOT allow the strip to stay in the well plate; as it will soak up your solution. Record your observations3. Repeat the above steps with blue litmus indicator paper. Record your observations on the date table.4. Add 1 drop of cabbage juice indicator to each well. Record the color change. Using the color chart provided; predict the pH of each substanceObservations#Household Substance to testPredictionAcid, Base, or NeutralRed LitmusBlue LitmusCabbage IndicatorpH paper colorpH of solutionAcid, Base, or Neutral?1MILK2VINEGAR3BAKING SODA SOLUTION4MILK OF MAGNESIA5COKE ZERO6TAP WATER7WINDEX8HAND SOAP9SHAMPOO10AMMONIA11HOUSEHOLD CLEANER12KOOL-AID13COFFEE14DISSOLVED ANTACID15BORAX SOLUTION16DRAIN CLEANER17VANILLA EXTRACT18ORANGE JUICEQuestions: Which of the household solutions are acids? Which are bases? How did you determine this?Describe how acids and bases affect the color of each indicator you used.Describe how the color of the red cabbage juice indicator changes as you move from highly acidic to highly basic solutions. Note any color patterns that you observe.What are the advantages and disadvantages of litmus paper and the natural indicators. Which indicator do you think is best?Are the cleaning products acids, bases, or neither?What are the acid/base characteristics of foods and beverages?Are there consumer warning labels on basic or acidic products?What other substances do you think could be used as a “natural indicator”?What did you learn from this lab? Were there any results that surprised you? ................
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