sorry the magnesium wont give the fish diareah i was joking milk of magnisum is a laxitive...
the type of magnessium that is in the mix you have
even if you added it to acid.. acetic .. the acid is going to be the limiting reactant! and because you dont know the molarity of the acid and you would have to have excess acid ... therefor your not going to get free Mg ions in the water
if you mix magneisum hyroxide with H2O ... it forms milk of magnesium which has a very low solubility...
the problem is that the mix seems to have a lot of CaCO3 which has a low solubility...
i still dont understand the % that you have down... since it adds up to over 100% ?... is there any other info given?
ask your chem teacher about it ?
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