Posted by mohammed on Sunday, January 16, 2011 at 11:08pm.
Concentration is the word you need.
if the molar concentration of Sr(OH)2 is .02M, then you have with complete dissociation .02M of Sr++, and .04M of OH-. Now why did the OH double? The reason is that in each molecule of Sr(OH)2 you had two OH ions.
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