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

Answer 1

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.

Answer 2

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.

Answer 3

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

Answer 4

Thank you very much for your answers