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MgSO4 is extremely hygroscopic - it absorbs water with great enthusiasm. So, I doubt that you can buy anhydrous MgSO4 except perhaps at a chemical supply place. Epsom salts is what we can buy and cheaply.
 

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Discussion Starter #3
That's what I figured. I just wanted to double-check since it would make a significant difference in Mg concentration in the final solution.
 
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