Essay on Volumetric Analysis Chemistry Lab Report

966 Words Oct 30th, 2012 4 Pages
Introduction:

The purpose behind (the first step in) this experiment is to show that similarly to week 1, the molarity of an acid or base in solution can be determined (so long as one value’s is known) using titration. In this case though, finding the molarity of the acid used in the reaction is then used to determine the percent of that acid in a vinegar solution and compared to the standard value for % acid present in vinegar. The second part of the experiment was to see if by titrating a solution of NaOH and an unnamed mystery acid, you could find the molar mass of the unknown acid (solving the mystery). It must be understood that the number of moles of the reacting NaOH and the number of moles of the product NaX acid, must both
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The small error could be a result of error in experiment or an actual failure of the acid to meet the federal standard. An example of error in experimentation is while the solution is titrated completely, the flask being swirled is removed from underneath the buret and a drop or two of NaOH can sneak out before the valve is closed. Those few missed drops as well as excess NaOH in titration can affect the accuracy of the results. Human error is almost always a factor for example when measuring any values without digital assistance leaves room for the naked eye to make mistakes. As far as the second part of the experiment was, the 0.0025% deviation indicates that the titration was accurate. The ending molar mass (202.59 g/mol) of the mystery acid points to two possible suspects. The first being Cesium Diuranate, and the second Sodium Diuranate. Without the information it wasn’t possible to determine which one it would be. There is also a chance that the results had small deviation (accurate) but were not precise. For example if both titrations had error due to the mass of the samples being incorrect. There was also a potential error during the second titration. While adding the indicator to the acid solution the tip came in contact with the buret and the drop of indicator managed to seep up the buret into the NaOH and so all the NaOH that had turned purple had to be

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