Homework Help: chemistry

Posted by tarkan on Friday, December 24, 2010 at 5:15pm.

an impure sample of oxalic acid C2O4H2, with a mass of 0.465g, is dissolved in water. a few drops of phenolphthalein indicator solution are added, and the solution is titrated with 0.190 mol/L aqueous sodium hydroxide held in a burette. the solutointurns pink when 49.5mL of sodium hydroxide has been added. what is the percent purity of the oxalic acid sample.
please somebody help me with that is a assignment and i need to finish it and also understand it clearly....so plz can someone show me how to do it with steps and tell me the answer too plzzzzzzzzz......thank you :)

chemistry - DrBob222, Friday, December 24, 2010 at 7:55pm
H2C2O4 + 2NaOH ==> Na2C2O4 + 2H2O

moles NaOH = M x L = ??
moles H2C2O4 = 2 times moles NaOH (from the equation).
grams H2C2O4 = moles H2C2O4 x molar mass H2C2O4.
%H2C2O4 in sample = (grams H2C2O4/mass sample)*100 = ??

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