AP Chem lab question

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Discus: SAT/ACT Tests and Test Preparation: April 2004 Archive: AP Chem lab question
By Leejwwc (Leejwwc) on Wednesday, March 31, 2004 - 08:31 pm: Edit

An aqueous solution of calcium hydroxide is titrated with a strong acid.

If water is added to the erlynmeyer flask in the course of the above titration, would the calculated value of Ksp be too high, too low, or correct, and why?

By Joel_Set (Joel_Set) on Thursday, April 01, 2004 - 02:29 am: Edit

somebody answer this?

By Eastsoldier (Eastsoldier) on Friday, April 02, 2004 - 08:56 am: Edit

Ca(OH)2 is titrated ->
Ca2+ and anion of the acid remains (aqueous)


add water


nothing happens
(water doesn't react. If it did, it would have happened before you put the water)

unless... it is not completely titrated

Note : Ksp : solubility constant
At equilibrium Ksp=Q


I'm not 100% sure with this, though.

Concentration will get lowered as you add water
(Was there some indication of what that acid was? ie. monoprotic or polyprotic?)

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