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mixed, and finally add water from a disposable pipet to bring the liquid level to the
mark. Do a final mixing by inverting and swirling the flask at least 30 times. Keep
the volumetric flask sealed as much as possible to minimize the opportunity for air
oxidation to occur.
Analytical Sample. Follow a similar procedure as above but use an accurately
weighed ca. 100 mg sample of a commercial Vitamin C tablet in place of the ascorbic
acid. You will first have to crush the Vitamin C tablet in a folded sheet of paper
using your small iron ring as the hammer, making a fairly fine powder. Further grind
the crushed tablet using the pointed end of a centrifuge tube as a pestle and a small
beaker as a mortar into a very fine powder. These tablets sometimes contain binders,
which will not completely dissolve.
Solution with Metal Ions. Accurately weigh ca. 100 mg of ascorbic acid and transfer
it quantitatively to a clean 250 mL volumetric flask. Partially fill the volumetric flask
with deionized water and...
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This note was uploaded on 04/09/2013 for the course CHE CHE 2C taught by Professor Nasiri during the Spring '07 term at UC Davis.
- Spring '07