chemProject 7

chemProject 7 - Project 7: Acids and Bases Final Lab Report...

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Project 7: Acids and Bases Final Lab Report Briana Ply Chemistry 102 Laboratory, Section 42 Instructor: Bradley Stadelman April 6, 2010 “My signature indicates that this document represents my own work. Outside of shared data, the information, thoughts and ideas are my own except as indicated in the references. I have submitted an electronic copy through Blackboard to be scanned by TurnItIn.com. In addition, I have not given aid to another student on this assignment.” X________________________________________________ ABSTRACT This paper describes
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The goals in this experiment were INTRODUCTION The goal of this project is to investigate the properties of four unlabeled solutions as well as four common household items. The specific goals include determining if the solutions are acidic or basic by finding the pH, determining the nature of each solution in terms of concentrations and species present, and finding the properties and concentrations of acidic or basic household items. The purpose of this experiment is to identity the four unknown solutions by performing a variety of tests that measure the properties including its pH, concentration, and presence of ions. We used many of the laboratory techniques, (i.e. titration, use of pH meter, choosing an indicator, and dilution of solutions), that were illustrated in the Cooperative Chemistry Laboratory Manual (Cooper, Section 3) in order to perform some of the tests in this experiment. We are always discovering new compounds in the environment that have not been identified before. For example, forensic scientists investigate crimes by collecting and analyzing physical evidence. They must be able to identify unknown chemicals on a regular basis in order to solve crimes (Harris, 2007). Many real-life situations require the ability to identify unknown compounds in our environment. RESULTS In order to identify whether the compound was acidic or basic and the identity of the compound, we performed a variety of tests including a pH paper test, a cation flame test, and an anion test. Table 1 pH Paper Test Unlabeled Bottle Color of pH Paper pH 1O Dark blue 12 (basic) 2H Pink 1 (acidic) 3H Greenish blue 10 (basic) 4I Reddish orange 2 (acidic) Table 2 Analysis of Cations Unlabeled Bottle Flame Test Color Element Predicted Identity of Compound 1O Pale violet Presence of potassium ion KOH
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Test for Ammonium (NH 4 + ) Smell Element Predicted Identity of Compound 3H Ammonia Presence of ammonium ion NH 4 OH Table 3 Analysis of Anions Unlabeled Bottle Presence of Sulfate Ion Presence of Nitrate Ion Presence of Chloride Ion Presence of Carbonate Ion 1O No No No No 2H No Yes No No 3H No No No No 4I No No No No Table 4 Identity of Compounds Unlabeled Bottle Identity of Compound 1O KOH 2H HNO 3 3H NH 4 OH 4I CH 3 COOH Table 5 Acid-Base Titrations (5 mL of each bottled solution used for titration) Compound KOH HNO 3 NH 4 OH CH 3 COOH pH of Solution (Bottled solution + H 2 0) 13.5 1.3 11.0 2.5
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Titrant Used (Acid = 1M HCl, Base = 6M
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chemProject 7 - Project 7: Acids and Bases Final Lab Report...

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