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Experiment A3
Acid–Base Titrations

Standard HCl titration of NaOH. New Titration Method using glass buret
(introduced in Dec 2009)
Standard HCl titration of NaOH
(old setup used until 2009)

New Titration Method using glass buret (introduced in Dec 2009)

Aspirin tablet dissolving in standardized NaOH


Aspirin tablet dissolving in standardized NaOH

In this experiment, you determine the amount of ASA in an Aspirin tablet using acid–base chemistry. The ASA is hydrolyzed with a known amount of NaOH, and the excess NaOH left over after the reaction is titrated with HCl standard. Using simple arithmetic, you solve for the moles of ASA present and compare the value to the one obtained spectrophotometrically in Experiment A2.

Part A Equipment List Part A Chemical List
general pan balance
retort stand and buret clamp
plastic funnel
1000-mL beaker
100-mL volumetric flask and label
5-mL volumetric pipette
pipette filler bulb
10-mL glass buret and stopcock
50-mL Erlenmeyer flask
vial
labels *
meniscus reader *
flat surface *
sodium hydroxide pellets (~0.4 g)
0.1000 N hydrochloric acid standard (~20 mL)
cresol red indicator
tap water *
Part B Equipment List Part B Chemical List
general pan balance
retort stand and buret clamp
1000-mL beaker
100-mL volumetric flask
50-mL volumetric flask
10-mL volumetric pipette
pipette filler bulb
10-mL glass buret and stopcock
plastic funnel
125-mL Erlenmeyer flask
vial
labels *
meniscus reader *
heat source *
flat surface *
standard sodium hydroxide solution (from Part A)
0.1000 N hydrochloric acid standard (~20 mL)
phenolphthalein indicator
four Aspirin tablets
tap water *

* Not included in the kit; must be provided by the student at home.

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