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Titration Questions

  1. Jan 13, 2016 #1
    1. The problem statement, all variables and given/known data

    A sample of saturated Ca(OH)2 solution in water is collected in flask #1, filtered into flask #2, then 25.00mL samples were transferred into flasks #3, #4, #5. Which flasks had to be dry and which could be wet?

    Also, flask #2 was stoppered. Why?

    2. Relevant equations

    3. The attempt at a solution

    I think only flask #1 could be wet since it is the only flask that has unfiltered solution.

    I think flask #2 was stoppered since it was filtered to prevent contamination, but would it affect Ksp if it wasn't stoppered?
  2. jcsd
  3. Jan 13, 2016 #2


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    Gold Member

    With no purpose stated I cannot see how it matters whether any flask is dry or wet.

    Stoppering the bottle is to stop it something getting to it, what could that be?
  4. Jan 13, 2016 #3
    The purpose was to determine the Ksp of calcium hydroxide using titration calculations
  5. Jan 14, 2016 #4


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    Staff: Mentor

    That's the general purpose of the whole process, but you have not stated purposes of individual transfers - and that's what matters.
  6. Jan 14, 2016 #5


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    Gold Member

    Well we now know it is needed to know for sure that the solutions he gets at the end are exactly saturated. Not difficult to see what needs to be dry IMO.
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