Lab#5 - 2 an antacid such as Alka-Seltzer(sodium...

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Molecular Mass of an Acid and the Analysis of Vinegar Experiment #5 October 19, 2007
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1.) Three replicate titrations are done for each sample in order to attain the most accurate results possible and to therefore avoid inaccurate results. Since it is possible in the experiment for one to add more volume of the standard solution than needed to reach the endpoint, which results in inaccurate results, it is best to do to three replications for reach sample. Doing three replications may increase the odds of results with greater accuracy and if the data for the three samples are precise and closely related, then one could assume that one’s results and performance were correct. With these three replications, one can calculate the average molarity, which minimizes the effects of possible inaccuracies. 2.) Three household products that could be analyzed by titrations: 1. a carbonated soft drink such as Coke, because the acidity can be determined by titrating against a standard base, 2.
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Unformatted text preview: 2. an antacid, such as Alka-Seltzer (sodium bicarbonate), because the base of the antacid can be determined by titrating against a standard that is acidic, and 3. a household cleaner, such as a window cleaning product, because the concentration of ammonia can be determined by titrating against a standard that it acidic. 3.) It is necessary to add an indicator, because it allows us to visually observe when a particular solution has reached the endpoint of the titration. The indicator lets us know when we have added a correct amount of base or acid, depending on the experiment, in order for the solution to neutralize. An indicator works as either a weak acid or base having a certain color and gives an indication of when the solution has neutralized and when the titration should end. When a particular solution containing the weak indicator is titrated, the solution will be titrated until the indicator has formed enough so that the solution changes to a different color....
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