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Homework Help: Determining Volume

  1. Aug 17, 2015 #1
    1. The problem statement, all variables and given/known data.
    This question is based on an experiment to determine the mass of ASA.
    Information from the experiment :
    • ASA is a weak acid with a Ka value of 3.2 x 10^-4.
    • An ASA tablet has an approximate mass of 500 g.
    • The experiment used a titration with a standardized 0.100 mol/L NaOH.

    The balanced equation is HC9H7O4(aq) + NaOH(aq) -> NaC9H7O4(aq) + H2O(l)

    a) What volume of base will you substitute into the formula when you calculate the number of moles of base used?

    2. Relevant equations.



    3. The attempt at the solution

    First determine molar mass of HC9H7O4
    =180.17 g/mol

    =(0.500g ) / (180.17g/mol)
    =2.78 x 10^-3 mol

    =(2.78 x 10^-3) / (0.1mol/L)
    =0.0278 mL
    =27.8 L

    Could someone let me know if I determined the volume of the base correctly? Thanks.

  2. jcsd
  3. Aug 17, 2015 #2


    User Avatar

    Staff: Mentor

    You mixed up units in the last two lines, but - assuming you meant L first, mL second - your calculations look OK.

    But it wouldn't hurt to write more precisely what you are calculating. I am guessing you are checking what should be approximate volume of the base required to titrate ASA from a single tablet, but it doesn't necessarily follow from your post.
  4. Aug 17, 2015 #3
    Thanks, and sorry for my lack of clarity.
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