Chemistry Experiment 3

Chemistry Experiment 3 - Experiment 3 Acid/Base Behavior...

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Experiment 3: Acid/Base Behavior of Aqueous Ions or Why are the solutions not neutral? By Jennifer Knotts Lab Partners: Katlin Chemistry 1312, Section F-1, February 8, 2007
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Introduction: This lab was performed to provide a study of acid/ base behaviors of several soluble compounds and provide knowledge in proper preparation of salt solutions of various molarities and measuring their exact pH. This experiment marked the beginnings of acid/ base exploration. For example, organic compounds that are Lewis acids are known as electrophiles, which attract electrons from electrostatic attraction. “Acid” has three different meanings: 1. Increases the amount of hydronium ions, H 3 O + in aqueous solutions 2. Any substance that is a proton donor 3. An electron-pair acceptor. Whereas, an Arrhenius base has three meanings also but increases the concentration of hydroxide ions, OH - , and serves as a proton acceptor instead of a donor. Bases are generally referred to as “nucleus-loving” electron pair donors and are often compounds with lone pair electrons known as ligands in inorganic coordination chemistry. There are three types of systems dealing with ions: monoprotic, amphoteric and Lewis acids. For example, an acid containing one ionizable hydrogen atom per molecule is referred to as a monoprotic acid same as for a base. However, if an ion can both accept and donate a proton it’s amphoteric. Hydrogen anions are an example of this polyprotic system. Lewis acids are more complex then the first two systems and deal mainly with metal ions. Purpose: The concept of this experiment was to provide an opportunity to gain valuable insight in the classification of both acid / base behaviors by coming to terms with some very important and useful skills. In the first part of the experiment, a better understanding of proper dilution methods was grasped. Then in the second and third part, the measuring technique of pH of solutions was clutched. Finally, the collected data was compiled to solve several equations. Procedure: Procedure: The procedure was adapted with permission from Block and McKelvy, “Laboratory Experiments for General Chemistry:, 5 th ed., Thomson Brooks/Cole, 2006” with the following changes: For example, split the salts up between the groups so that each group is responsible for one salt’s calculations ONLY. Then, compile all the gathered data between groups and finish out the rest of the calculations
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Chemistry Experiment 3 - Experiment 3 Acid/Base Behavior...

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