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Homework Help: Calculating amount of H2SO4 needed for dilution

  1. Aug 27, 2016 #1
    1. The problem statement, all variables and given/known data
    How much 4.00M of HCl is required to make 100ml of 0.400M HCl?

    2. Relevant equations
    M1V1 = M2V2

    3. The attempt at a solution
    Its (4.00M)*(xL) = (0.400M)(0.100L)
    I think its 0.005L but the possible answer (multiple choice) say otherwise...
  2. jcsd
  3. Aug 27, 2016 #2
    I just need confirmation if i did it right or i messed up on something

  4. Aug 27, 2016 #3


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    Science Advisor
    2017 Award

    This equation is setup correctly.

    But the number you get is incorrect. Try re-doing the calculation.
  5. Aug 27, 2016 #4


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    Homework Helper
    Gold Member

    They ask you how much of a solution is required to make (100 ml of) a solution a tenth as concentrated and you need a formula?
  6. Aug 27, 2016 #5
    The question should say How much 4.00M of HCl is required to make 100ml of 0.200M HCl?

    Oops typo, I meant to say (4.00M)*(xL) = (0.200M)*(0.100L)
  7. Aug 27, 2016 #6
    but the multiple options are 0.000125L, 1250ml, 125 ml, 50,000ml

    so please advise
  8. Aug 27, 2016 #7
    naturally, i'd want to pick the smallest value which is 0.000125L, but its not what i got
  9. Aug 28, 2016 #8


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    Staff: Mentor

    Must be a mistake in the test (assuming you finally listed the problem and answers right).
  10. Aug 28, 2016 #9


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    Science Advisor
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    Gold Member

    ... or, 4.00 M H2SO4?
  11. Aug 28, 2016 #10


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    Staff: Mentor

    So the thread Subject is wrong?
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