Titration Questions Homework: Dry/Wet Flasks, Stoppering Flasks

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Badgeray
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Homework Statement



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?

Homework Equations

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?
 
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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?
 
The purpose was to determine the Ksp of calcium hydroxide using titration calculations
 
That's the general purpose of the whole process, but you have not stated purposes of individual transfers - and that's what matters.
 
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.