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Get ready for book fair HW: Review your procedure Do Now for 3/13/13 Slide 2 C46 Investigating Solutions of Acids and Bases Todays target: I will be able to design a procedure and data table to determine whether various liquids are acids, bases, or neutral.acids, bases, or neutral Book Fair Check C43 and C44 Introduce C46 Design procedure and data table Slide 3 C43 Municipal Water Treatment Lab Check Write up 5 points Stopping to Think Questions (1 through 4) 5 Points Analysis (1 through 6) 5 points Total = 15 Points Slide 4 C44 Willow Grove Water Quality Report Lab Check Write up 5 points Analysis (1 through 6) 5 points Total = 10 points Slide 5 C46 Investigating Solutions of Acids and Bases Read background and challenge on page C-82 Write up lab report Slide 6 Read the Part A Procedure Steps 1 through 9 Procedure Work with you partners to develop a procedure to test the liquids Write clear easy to follow steps Start with Hydrochloric acid, water, Potassium hydroxide Make sure each liquid is tested with all three (3) indicators Data Table Work with your partners to develop the table (On a separate sheet of paper). Be prepared to share your table with the class. What substances are we testing? Hydrochloric Acid, Water, Potassium hydroxide (Base), Rubbing alcohol, Lemon-lime soda, Milk, OJ, Laundry Detergent, Baking Soda (in water) What are we testing them with? How many rows do we need? How many columns? What is a good title? Slide 7 Do Now for 3/14/13 Take out C46 write up HW: Draw the data table and review the procedure for Part B Slide 8 C46 Investigating Solutions of Acids and Bases Todays Target: I will be able to use my procedure to gather data about the different household samples. Review data table Lab safety Gather data for part A Clean up Slide 9 Sample Data Table SamplePhenolphthaleinUniversal Indicator Solution pH Paper Hydrochloric Acid Water Potassium Hydroxide Rubbing alcohol Lemon-lime soda Milk OJ Laundry Detergent Baking soda and water Slide 10 Equipment (DONT MIX CAPS AND BOTTLES) Lab Safety: Goggles and aprons No eating or drinking in lab Anything gets on your skin, WASH IT OFF!!! Rinse your tray between tests Clean station when done. Slide 11 Do Now for 3/15/13 Take out C46 information HW: Analysis 1 through 5 Slide 12 C46 Investigating Solutions of Acids and Bases Todays Target: I will be able to use my data to determine if my samples were acids, bases, or neutralacids, bases, or neutral Review data from yesterday Review procedure Lab safety Gather data Clean up Review data Analysis Slide 13 Sample Data Table SamplePhenolphthaleinUniversal Indicator Solution pH Paper Hydrochloric AcidClear/no changeRed WaterClear/no changeYellow-green Potassium Hydroxide PinkBlue Rubbing alcoholClear/no changeYellow-green Lemon-lime sodaClear/no changeOrangeRed-orange MilkClear/no changeGreen OJClear/no changeRed Laundry DetergentPinkBlueblue Baiking soda and water PinkBlue Slide 14 C46 Investigating Solutions of Acids and Bases Review procedure for part B Working in groups of 2 Review serial dilution process. Slide 15 10 drops of water in cup 7 HCl or KOH Slide 16 C46 Investigating Solutions of Acids and Bases Equipment (DONT MIX CAPS AND BOTTLES) Lab Safety: Goggles and aprons No eating or drinking in lab Anything gets on your skin, WASH IT OFF!!! Rinse your tray between tests Clean station when done. Slide 17 10 drops of water in cup 7 HCl or KOH Slide 18 Slide 19 Slide 20 Slide 21 Slide 22 C46 Investigating Solutions of Acids and Bases Complete Analysis 1 through 5 on page C-85 Slide 23 Do Now for 3/18/13 Take out C46 materials HW: C46 will be checked tomorrow Benchmark test on Wednesday Slide 24 C46 Investigating Solutions of Acids and Bases Discuss analysis 1 through 5 Slide 25 C46 Investigating Solutions of Acids and Bases 1. Group the nine substances you tested based on how they interacted with the indicators. AcidsNeutralsBases Hydrochloric acidWaterPotassium hydroxide Lemon lime sodaRubbingBaking soda Alcohol Orange juiceMilkLaundry detergent Slide 26 C46 Investigating Solutions of Acids and Bases 2. Which do you think is the most useful indicator? Explain your answer by considering the advantages of each indicator. pH paper and Universal Indicator Solution are the better ones because they tell us whether a substance is an acid, a base, or a neutral. Advantages : pH paper stored as dry paper and color changes can be seen in colored liquids much easier than Universal Indicator Solution Slide 27 C46 Investigating Solutions of Acids and Bases 3. What happens to the pH of an acid or a base solution as you dilute it with water? It becomes closer and closer to 7, or neutral. 4. Do you think that dilution with water is a good method for treating industrial waste that contains an acid or a base? Explain the reasons for your answer. It works to produce a neutral solution, but it may not be a good method because it would take a lot of water to dilute a large volume of acid to a neutral pH. Slide 28 C46 Investigating Solutions of Acids and Bases 5. Reflection: Think about your experiences tasting or touching everyday substances like vinegar, lemon juice, and detergents that you now know to be acidic or basic. What do the acidic substances seem to have in common? What do the basic substances seem to have in common? Slide 29 C46 Investigating Solutions of Acids and Bases 5. We know that - AcidsBases - Taste Sour - Turns Universal indicator and pH paper red/orange - Corrosive - Can react with baking soda to make bubbles. - Taste bitter - Turn Universal indicator and pH paper blue - Feel Slippery - Corrosive Slide 30 C46 Investigating Solutions of Acids and Bases Key Points 1. Substances that react in similar ways can be categorized accordingly; acids and bases are examples of such categories. Reactions with indicator chemicals can distinguish acids from bases in solution. 2. Acids and bases have characteristic physical and chemical properties. 3. Common materials, such as household chemicals, are often acidic or basic in solution with water. Slide 31 C46 Investigating Solutions of Acids and Bases 1. Acidic: Anything that is acid forming. 2. Acid: A material that acts as if it were the opposite of a base in a reaction. Acids taste sour and are usually very corrosive (destructive to metal or flesh). A strong acid has a pH below 1 on the pH scale. Some strong acids are nitric, sulfuric, and hydrochloric acids. 3. Acidity: The state or degree of being acid. Slide 32 C46 Investigating Solutions of Acids and Bases 4. Base: A substance that acts in an opposite way to an acid in a reaction. Bases taste bitter and are usually corrosive. Some strong bases include sodium hydroxide (lye) and chlorine bleach. Bases have a pH higher than 7. 5. Basic: Anything that forms a base. 6. Basicity: The state or degree of being base. Slide 33 C46 Investigating Solutions of Acids and Bases Corrosive: A substance that may dissolve metals, ruin clothing, or burn skin. Strong acids and bases are corrosive. 8. Neutral: A solution that has a pH of 7. It is neither an acid or a base. 9. pH scale: A scale that measures the pH (acidity or basicity) of a solution. Slide 34 C47 Acids, Bases, and the pH Scale C46 will be checked tomorrow. Benchmark on Wednesday Write up Activity C47 beginning on page C-86 Read the activity (pages C-86 through 89) and fill out Student Sheet 47.1