Quant Analysis Lab 4.docx - Sean Murphy Quantitative...

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Sean MurphyQuantitative AnalysisGroup 2Dr. WeiPotentiometric TitrationsObjective:To use potentiometric titration data to obtain a Gran Plot, titration curve and linear regression to determine the equivalence point and Ka value (dissociation constant); calculate the molecular weight (g/mol); and utilize this information to determine the identity of the unknown acid.Introduction:Potentiometric titrations are a reliable and repid method of determining the equivalence point. A titration curve (pH versus volume of NaOH) is used to estimate the equivalence point and to determine if the acid is monoprotic or diprotic.Materials:0.1M sodium hydroxide solution50mL buret250mL volumetric flask250mL beakerpH meter with glass electrodebuffer solutionmagnetic stirrerunknown weak monoacid or diprotic acidProcedure:1.Rinse a clean buret with distilled water and 0.1M NaOH. Fill buret with standardized 0.1M NaOH solution and record the initial volume of solution.
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