Acid Base Titration
March 1, 2013
Purpose: The purpose of this experiment is to determine the concentration of a solution of NaOH by titration with a standard solution of HCl. It was also the purpose to determine the concentration of a sample of white vinegar by titration with a standard solution of NaOH. Introduction: Using the method of titration is how the experiment gets to the conclusion of the concentration of a solution. When doing this experiment, measurement is very important to obtain the solutions correct concentration. Noting the equivalence point is also another part of this experiment. When neutralizing an acid with a base, using an indicator shows rather the colors indicate the reactions of each acid and base pair. A balanced equation and simple calculations will then allow us to determine the concentration of the solution. Procedure: Within this experiment, we used two 50mL burets, distilled water, 10mL graduated cylinder, vinegar (acetic acid, HC2H3O2), phenolpthalein and 2 flasks of 125mL and 250mL. With using these materials, we first determine the titration of base unknown concentration. Using a buret, we allowed the buret to fill with the NaOH solution and it gained the initial volume of 5mL. After doing this, we read the initial and the final volume of the buret after the 10.0mL of acid was added. Then, three drops of phenolphthalein was added into the flask. We swirled the flask to mix and placed the flask on a white sheet of paper. Doing this, we saw that a color has been changed. Since there is a new color, because of the addition of the NaOH, we made sure to keep swirling our flask. The end point of this experiment is when we saw that the color had changed to a pink color. This was when we hit the point of the titration of NaOH. When doing the titration of Vinegar, the procedure was going to be about the same. To find out the titration of vinegar, we used 10.0mL of vinegar to a clean 250mL flask. Then we added 100mL of...
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