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normality question

Discussion in 'DAT Discussions' started by msu08, Jun 4, 2008.

  1. msu08

    7+ Year Member

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    The normality of a potassum permanganate solution is 2.10. What is the molarity of the solution if in the course of the reaction the potassium permanganate is changed to manganese dioxide?

    I understand the concept of normality but this problem is really stumping me. The answer is .70. anyone understand this?
     
  2. doc toothache

    10+ Year Member

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    Mn goes from +7 to +4 for a total gain of 3 electrons. For the reaction the equivalent weight for Mn is mol wgt/oxidation state change or is 1/3.

    http://forums.studentdoctor.net/showthread.php?p=6558533#post6558533
     
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