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Chemistry Forums for Students => Analytical Chemistry Forum => Topic started by: sainte on October 13, 2008, 07:27:22 AM

Title: CALCITE AND aRAGONITE activity problem
Post by: sainte on October 13, 2008, 07:27:22 AM

Aragonite and calcite are different crystalline forms of CaCO3. If the activity of calcite is taken as unity, what would the activity of aragonite have to be in order for it to maintain the same activities of Ca2+ and CO32- in solution that calcite does?
Log K = -8.336 ARAGONITE
Log K = -8.48 CALCITE

thx in advance

Title: Re: CALCITE AND aRAGONITE activity problem
Post by: sainte on October 13, 2008, 09:37:35 AM

the problem i am having is setting this up , since calcite is set to unity and i am tryign to setup the formula to calculate activity for aragonite , and thats what i am not being able to produce .