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Lab 3 - Elisa Giordano Section Date Lab 3 Acids Bases and...

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Elisa Giordano Section: Date: September 26, 2006 Lab 3: Acids, Bases, and Buffers EXPERIMENT 1 : HYPOTHESIS : The hypothesis for adding HCl to water is that as the number of drops of HCl increases, the pH will become more acidic. As for adding NaOH to water, as the number of drops of NaOH increases, the pH will become more basic. The hypothesis for beakers 3 and 4, one containing buffer and an acid and the other containing buffer and a base, respectively, the pH of the solution will generally stay the same. Although, beaker 3 may tend toward a pH more acidic while beaker 4 may tend toward a pH more basic. GENERAL PROCEDURES : The first thing done in this lab was calibrating the pH meter. After calibrating the meter, it was used to measure the pH of the water in beakers 1 and 2, and the buffer in beakers 3 and 4, as well as the pH of .5% HCl and .5% NaOH. Five (5) drops of HCl were then added to beakers 1 and 3, and five (5) drops of NaOH were added to beakers 2 and 4, the pH was measured and recorded. More drops of HCl and NaOH were added in increments of 5 to their respective beakers and the pH was measured and recorded. A Graph was then plotted of the data from the four beakers. Other equipment that was used in this lab included: 3 pipets, 4 beakers, the pH meter, deionized water, .5% HCl solution, .5% NaOH solution, buffer solution. DATA AND OBSERVATIONS : pH of .5% HCl 1.65 pH of .5% NaOH 12.34 Beaker 1: Water and Acid Beaker 2: Water and Base Drops Added pH Drops Added pH 0 6.53 0 5.8 5 2.6 5 10.33 10 2.49 10 10.77 15 2.43 15 11.07 20 2.35 20 11.14 25 2.35 25 11.25 Drops Added pH Drops Added pH 0 6.93 0 6.92 5 6.95 5 7.06 10 6.84 10 7.15 15 6.8 15 7.15 20 6.8 20 7.3 25 6.75 25 7.45
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