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% of Na2CO3 in an unknown sample

  1. Jul 19, 2012 #1
    1. The problem statement, all variables and given/known data
    A student titrated 25 ml HCL with 24.79 ml NaOH. When 0.4872 g KHP was titrated with NaOH, 25.31 ml NaOH was used. A Na2CO3 solution was made using 1.8746g of unknown Na2CO3 sample in a total volume of 100 ml of solution. Then 10 mL Na2CO3 was titrated with 10.93 ml of HCL solution. What is the % Na2CO3 in the student's unknown?


    2. Relevant equations



    3. The attempt at a solution
    Do I need to use normalities here? I don't even know how to start off this problem
     
  2. jcsd
  3. Jul 21, 2012 #2

    chemisttree

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    You always start by writing out the reaction of interest... HCl + Na2CO3 -----> ???
     
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