UnknownAcidWeek2 - Identification of a Weak Acid Unknown,...

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Identification of a Weak Acid Unknown, Part II Quantitative Data for Qualitative Identification
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Goal: Use Titrimetry to Identify an Unknown Make and calibrate NaOH solution Titrate precisely-known mass of unknown substance using pH meter Equivalence point of titration curve indicates molecular weight Number of inflection points suggests number of titrable protons If identification correct, working curve can be precisely simulated in Excel
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Week 1 Make concentrated NaOH Make carbonate-free water Dilute NaOH to leave it carbonate free Dry potassium hydrogen phthalate (KHP) to use as a primary standard Weigh 4 aliquots of KHP Titrate KHP with NaOH to standardize the NaOH (if time available) Obtain an unknown weak acid Dry the unknown
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Titrate NaOH to standardize if not done in Week 1 Weigh 4 aliquots of unknown weak acid Titrate the weak acid with standard NaOH, monitoring each titration with a pH meter From the shape of the titration curve, determine the equivalent weight of the acid From the shape of the titration curve, determine the pK a (or pK a s) of the acid
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This note was uploaded on 01/06/2011 for the course CHEM 223 taught by Professor Scheeline during the Fall '08 term at University of Illinois at Urbana–Champaign.

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UnknownAcidWeek2 - Identification of a Weak Acid Unknown,...

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