Homework Help: chemistry

Posted by Anonymous on Monday, January 28, 2008 at 4:37am.

An aspirin tablet weighing 0.502 g has been analyzed and contains 68.2 % ASA (180.16 g/mol) by mass. A student dissolved
the tablet in hot NaOH and the cooled solution was diluted with DI water to the mark in a 250 mL volumetric flask. Exactly 3.00 mL
of the solution was pipetted into a 100 mL volumetric flask and diluted to the mark with FeCl3 solution.
The concentration of the diluted solution is

chemistry - DrBob222, Monday, January 28, 2008 at 9:27am
DrWLS worked this problem yesterday.
0.502 g x 0.682 = g ASA in tablet.
g ASA in tablet/molar mass = mols ASA in tablet.
mols ASA in tablet/0.250 L = xx molarity in the 250 mL flask.
Dilution was 3:100; therefore, the new solution is xx M x 3/100 = yy M in the 100 mL flask.
Post your work if you get stuck.
chemistry - Anonymous, Monday, January 28, 2008 at 1:23pm
thank you i got it
chemistry - Anonymous, Sunday, January 25, 2009 at 6:38pm
if I'm following this correctly, the answer works out to 2.28E-4 correct?
chemistry - claudia, Saturday, April 16, 2011 at 3:31pm
YES

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