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February 28, 2015

Homework Help: AP CHEM

Posted by shylo on Thursday, July 31, 2008 at 10:50am.

Please help me with thses AP CHEM homework problems and show the steps to how to find the solutions:

Solid Liquid Titrations: Determine the concentration of the indicated liquid unknown given the mass of a solid standard and the buret data for the titration.


#35) What is the concentration of a potassium hydroxide solution given the following: 23.05 mL of KOH solution is required for complete reaction with 0.5346g of potassium hydrogen phthalate (KHP)? The molar mass of KHP is 204.23g.
NaOH(aq) + KHP(aq) --> NaKP(aq) + H2O(l)


#41) The concentration of a potassium permanganate (KMnO4) solution is established by titrationg a piece of iron wire that has beed previously dissolved in acid. What is the concentration of a solution of potassium permanganate given the following: 21.52 mL of the potassium permanganate solution is required for complete titration of 1.5125g of iron wire dissolved in acid.
8H+(aq) + 5Fe2+(aq) + MnO4- --> 5Fe3+(aq) + Mn2+ (aq) + 4H2O(l)

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