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Chemistry 103/113 Laboratory |
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This Week |
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Expt 4: Acid-Base Titration o
Preliminary
Assignment Due o
Quiz 3: Expt 3, Study Assignment E |
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Next Time |
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Expt
6: Photochemical Blues (week 1) |
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Notes for Today |
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Acid-Base Titration ·
Problem:
What is the molar mass of an unknown acid, HA? ·
Strategy:
Titrate known mass of HA with known molarity NaOH o
NaOH(aq) +
HA(aq) -> NaA(aq) + H2O(l)
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Tasks for Today o
Prepare 0.100M NaOH
titrant in a volumetric flask o
Weigh unknown acid
samples on the analytical balance
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Titrate acid with
0.100M NaOH (VNaOH
-> moles NaOH -> moles
HA)
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Phenolphthalein
Endpoint Detection
colorless (HA only)
… titrate … pink
(slight NaOH excess) ·
Safety
Issues and Waste Disposal o
Splash hazard with
acids/bases; goggles required throughout lab o
Solid acids and
titration mixtures are safe to dispose in the sink (NOT IN THE TRASH) |
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