UnknownAcidWeek1 - I dentification of a Weak Acid Unknown...

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Unformatted text preview: I dentification of a Weak Acid Unknown Quantitative Data for Qualitative I dentification Goal: Use Titrimetry to I dentify 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 • I f identification correct, working curve can be precisely simulated in Excel I s This a Realistic Lab? • Third world: yes • I ndustrial labs: autotitrators used to cut down manual labor BUT common measurement • Petroleum and pharmaceutical labs: same • Medical labs: uncommon (because samples are complex mixtures) • Autotitrator cost: $8,000 to $10,000. Maybe someday? 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 Week 2...
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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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UnknownAcidWeek1 - I dentification of a Weak Acid Unknown...

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