Experiment 4 Lab Report

Experiment 4 Lab Report - Abstract: The unknown...

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Abstract: The unknown concentration of HCl (an acid) was determined by adding the known molarity (0.01 M) of NaOH (a base). By measuring the volume of NaOH added, then measuring the pH of the acid and base mixture, the molarity of the acid can be determined when the pH reaches 7 (a neutral state). There were three trials conducted, the average of molarity of the acid in the three trials was found to be 0.00836 M. The known molarity of the NaOH was 0.01, which is rather close to 0.00836, only 0.00164 off. The uncertainty is ±2.5x10 -4 . Background: Reaching a pH of 7 by adding a base with a known molarity (in this case 0.01 M) to an acid with unknown molarity, shows how much base of that molarity was needed to neutralize the acid, therefore can determine the molarity of the acid. This is helpful when a substance has an unknown pH and it needs to be found. An example of when this is helpful would be when needing the pH of lakes or rivers to help the fish populations survive. Procedure: Refer to Experiment 4 in Utecht, R.; Downey, T; Miller, M; Hirko, R. Chem 112L-General Chemistry I Laboratory, 3 rd ed., Cache House, Inc: Eden Prairie, MN, 2009. 35 mL of distilled water was used
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Experiment 4 Lab Report - Abstract: The unknown...

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