How to prepare 5wt% MgSO4 aqueous solution using water and solid MgSO4.7H2O?

4 answers

Percent w/w is grams solute in 100 grans total solution.
5% w/w is 5g solute + 95 g solvent.
So you add 5 g MgSO4.7H2O to 95 g H2O. Stir until dissolved, stopper, label.
Since it is solid MgSO4.7H2O instead of solid MgSO4, does the 7H2O in the compound will affect the amount needed to prepare? If so, how to calculate it.
Yes, it makes a difference.
mm = molar mass
5 g MgSO4 x (mm MgSO4.7H2O/mm MgSO4) = ?
That means that ?g MgSO4.7H2O will give you exactly 5 g MgSO4
Thank you very much for your answers
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