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Material Type: Lab; Class: Technical Theatre Lab; Subject: Theater; University: Red Rocks Community College; Term: Unknown 1989;
Typology: Lab Reports
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Modified from Lab developed by Don Miller and Gordon Parker at University of Michigan - Dearborn. Lesson Title : Plop, plop, fizz, fizz – Let’s see how much relief there is! (Determination of the amount of a chemical substance) Grade level: 9- Curriculum Areas Math Science Technology Objectives of Lesson understand the concepts of neutralization become familiar with the technique of titration Colorado Content Standards: Mathematics: I. DEVELOP NUMBER SENSE Students make measurements II. USE ALGEBRAIC METHODS Students construct data tables of observations and measurements. Science: I. PROCESSES OF SCIENTIFIC INVESTIGATION Students practice the scientific method. Students identify sources of error in an experiment. II. PHYSICAL SCIENCE 2.3 Students observe and measure physical interactions of matter. VI. SCIENCE AS A PARTICULAR WAY OF KNOWING Students learn about refining a hypothesis based on an accumulation of data over time. Technology Standards: III. TECHNOLOGY PRODUCTIVITY TOOLS o Students use technology tools to enhance learning, increase productivity, and promote creativity. o Students use productivity tools to collaborate in constructing technology- enhanced models, prepare publications, and produce other creative works. V. TECHNOLOGY RESEARCH TOOLS o Students use technology to locate, evaluate, and collect information from a variety of sources. o Students use technology tools to process data and report results. VI. TECHNOLOGY PROBLEM-SOLVING AND DECISION-MAKING TOOLS o Students use technology resources for solving problems and making informed decisions
Materials: Tums, Rolaids, Milk of Magnesia Mortar and Pestle Weighing boats methyl orange solution hydrochloric acid Sheets of white paper Burets 3 125-mL Erlenmeyer flasks Funnels Handouts o Plop Table o Calculations/Question Sheet o “Acids and Bases” information sheet o Acid/Base Properties of Household Chemicals worksheet Technology Connection: Computers Printer Projection Device Publisher Digital Camera Excel Internet Teacher Background: In this lab, we will analyze the effectiveness of common preparations such as TUMS, Rolaids, and Milk of Magnesia in neutralizing the excess hydrochloric acid in your stomach. We will determine which product has the greatest acid neutralizing power per unit of cost. The active ingredient in an antacid is a base. A base is the opposite of an acid. When brought into contact with an acid both lose their characteristic properties, i.e. they are neutralized. The common bases used in antactid tablets are aluminum hydroxide (Al(OH) 3 ), magnesium hydroxide (Mg(OH) 2 , calcium hydroxide (Ca(OH) 2 or some combination of these. Although each will neutralize stomach acid, excessive use is not recommended. Aluminum hydroxide can cause constipation, magnesium hydroxide also functions as a laxative, and calcium hydroxide can stimulate extra acid production in the stomach to replace that which has been neutralized. Each of these antacids contains a chemical which reacts with the acid in your stomach, neutralizing it and reducing the excess acidity. We will add acid to the material of these preparations, and by measuring the amount of acid which is neutralized by the prescribed dosage, compare their capacities for acid neutralization. The chemical technique of neutralizing a chemical with a measured quantity of another chemical is known as titration. Your instructor will explain the concepts of titration, pH and indicators and will demonstrate the techniques involved. Then, you can carry out the procedures for the antacid preparation assigned to your group. We will compare results after you have finished. Take care to carry out your measurements with precision.
while constantly stirring to mix the contents. Close the stopcock periodically and swirl the flask. As you approach the end point, (the point at which all of the acid has been neutralized) each drop of acid will turn the solution purple, but after swirling it will return to green. At this point, add acid only one drop at a time. Continue to add acid, drop by drop, swirling the flask after each drop is added. When the purple color persists for one minute after swirling and an additional drop causes no deepening of the color, you have reached the end point. That is, all the antacid chemical has been used up, and the last drop of acid made the contents of the flask permanently acid. Record the final level of acid in the buret. final level_______________mL (3)
Alternate version of the lab on the web o http://www.geocities.com/CapeCanaveral/Hall/1410/lab-C-10.html o http://www.chem.latech.edu/~deddy/chem104/104Antacid.html o http://antoine.frostburg.edu/chem/senese/101/acidbase/faq/antacid- titration.shtml Version of this lab without costly burets o http://www.woodrow.org/teachers/chemistry/institutes/1986/exp24.html Technology Integration Lesson Plan o http://www.nisd.net/secww/science/Science-FinalProjects/Newman/ Technology%20Integration%20Lesson%20Plan.pdf