Experiment 8.docx - Prabhleen Sidhu Chem 1A Experiment 8...

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Prabhleen Sidhu Chem 1A Experiment 8 Part 1 “Standardization of a Sodium Hydroxide Solution” Part 2 “Determination of the Molar Mass of an Acid” Objective:
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The purpose of this experiment is to gain experience using volumetric equipment. Also, learn the technique of acid-base titration using an indicator, phenolphthalein. And, to determine the molar mass of an unknown solid acid. Method: In Part 1, a solution of the solid acid, oxalic acid dihydrate will be weighed into a volumetric flask to make a standard solution of oxalic acid. A solution of sodium hydroxide of an unknown concentration will be made by dilution. The molarity of the solution of sodium hydroxide will be determined by titration against a measured volume of the standard oxalic acid solution. The end point of the titration will be detected with the indicator, phenolphthalein. The molarity will be calculated from the measured amount of solution needed to reach the end point. There should be at least three precise titration runs. In Part two of the experiment, a weighed amount of the unknown solid acid will be dissolved in water and titrated with the standardized sodium hydroxide solution. The amount of sodium hydroxide solution needed to reach the end point, again indicated by phenolphthalein, will be measured. The molar mass of unknown weak acid will be
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