How to prepare 5wt% MgSO4 aqueous solution using water and solid MgSO4.7H2O?
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
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.
Thank you very much for your answers
To prepare a 5 wt% (weight percent) MgSO4 aqueous solution using water and solid MgSO4.7H2O, you will need to follow a specific procedure. Here's how you can do it:
1. Determine the amount of solution you want to prepare. Let's say you want to make 100 grams of the solution.
2. Convert the desired weight percent to grams. In this case, 5 wt% of 100 grams gives you 5 grams of MgSO4.
3. Calculate the amount of solid MgSO4.7H2O needed. MgSO4.7H2O has a molar mass of 246.47 g/mol, which means it contains 24.5 grams of MgSO4 per 100 grams of compound.
- So, to obtain 5 grams of MgSO4, you will need to use the following calculation:
(5 grams MgSO4) / (24.5 grams MgSO4/100 grams compound) = 20.4 grams of MgSO4.7H2O.
4. Weigh out the required amount of solid MgSO4.7H2O (in this case, 20.4 grams), using an analytical balance.
5. Dissolve the weighed solid MgSO4.7H2O in an appropriate volume of water to make a final solution of 100 grams.
6. Stir the mixture thoroughly until the solid is completely dissolved. You can use a magnetic stirrer or simply stir manually.
7. Once the solid is fully dissolved, you have successfully prepared a 5 wt% MgSO4 aqueous solution using water and solid MgSO4.7H2O.
Remember to handle chemicals carefully and adhere to proper safety measures while working with them.