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April 20, 2014

Homework Help: chemistry

Posted by kelly on Sunday, October 10, 2010 at 2:51pm.

The formula for epsom salt is MgSO4 . 7H20 If 1.250 g of the compound is dissolved in water, calculate the number of milliliters of .200 M Ba(NO3)2 that would be required to precipitate all of the sulfate ions as barium sulfate. I got that right with an answer of 25.4 milliliters.
Then it asks to make the same determination for 1.000 g of alum, which is AlK(SO4)2 .12H2O. I'm not sure .. is the mole to mole ratio 1:2? How do I figure this part out? Any answers would be greatly appreciated.

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