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Chemistry 103/113 Laboratory |
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This Week |
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Acid-Base
Titration o
Preliminary
Assignment Due |
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Next Time |
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Quiz
6: %Fe Analysis, Hot Pack ·
Lab Drawer
Check Out |
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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) · Phenolphthalein
Endpoint Detection
colorless (HA only)
… titrate … pink
(slight NaOH excess) ·
Tasks for Today o
Prepare
0.100M NaOH titrant in a volumetric flask o
Weigh
unknown HA (acid) samples on the analytical balance o
Titrate acid
with 0.100M NaOH (VNaOH ->
moles NaOH -> moles HA) o
Process data
(calculate molar mass) before dismantling the titration apparatus
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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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