Lecture Notes on Acid-Base Titration

Lecture Notes on Acid-Base Titration - CHM2020: Chemical...

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CHM2020: Chemical Principles 3 Laboratory CJT 2/10 Volumetric Analysis: Acid-Base Titration Lecture Notes Page 1 of 4 Part I Objectives Explain what is meant to be a standardized solution . Prepare a dilute solution of NaOH titrant Calculate the concentration of the NaOH standard solution Part II Objectives Distinguish the shape of the titration curve for a strong-acid with a strong base titration from that for a weak acid with strong base titration Explain why the beginning portion of the titration curve for a weak acid with a strong base appears different from that for a strong-acid with a strong base. Explain what is meant by a buffer solution. Indicate where buffering was observed in this experiment. Explain the process of back-titration . Use the volume of standardized base to determine the molarity and percent acetic acid in an unknown solution. Important Definitions Standard solution : a solution with concentration empirically verified within an indicated degree of uncertainty. Titrant: solution contained within the buret added dropwise to the sample. Back-Titration: volumetric-analysis setup where both the analyte and the standard solution are each housed in a buret and both can be added dropwise to determine titration end point. Buffer: a solution comprised of a weak acid or base and its conjugate ion that resists drastic changes in pH. burets Erlenmeyer Flask Indicator bottle White paper (for contrast)
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CHM2020: Chemical Principles 3 Laboratory CJT 2/10 Volumetric Analysis: Acid-Base Titration Lecture Notes Page 2 of 4 Key Constants & Formulae: Dilution Equation: c 1 V 1 = c 2 V 2 Sample Calculations: Prediction of Dilute NaOH Solution Concentration We want to find c 2 when the 25.0 mL (V 1 ) of the 2.0 M NaOH are added to 475.0 mL deionized water to form 500. mL total solution volume (V 2 ). NaOH
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This note was uploaded on 11/22/2010 for the course CHEM 1214 taught by Professor Christophertoher during the Spring '10 term at Northeastern.

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Lecture Notes on Acid-Base Titration - CHM2020: Chemical...

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