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Convert nitrate standard of 50 ppm to its nitrogen content

  1. Jun 10, 2017 #1
    1. The problem statement, all variables and given/known data
    Convert the nitrate standard of 50 ppm to its nitrogen content

    2. Relevant equations
    Since NO3 contains one nitrogen, molar mass 14.01, in a total molar mass of 14.01 + (3 *16.00) = 62.01, the maximum concentration permitted expressed as nitrate ion itself is (62.01/14.01) *10= 44 ppm

    This is what's in my books and I THINK it pertains to the question, however, I don't know why its being multiplied by 10 at the end.

    3. The attempt at a solution
    My guess would be that it would be 50ppm divided by the maximum concentration permitted, so 50/44=1.136, but that's wrong since my books says it's 11ppm. Unless I need to multiply by that mysterious 10....
     
  2. jcsd
  3. Jun 11, 2017 #2

    Borek

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    Staff: Mentor

    First of all - it is not clear to me how to understand "the nitrogen content".

    But in general, assuming it just means concentration of nitrogen in ppm, none of the approaches listed makes sense to me. Yes, there are 14 g of nitrogen per 62 g of nitrate ion, so if there is 50 ppm of nitrate, concentration of nitrogen is 14/62*50 ppm. Nothing more fancy.
     
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