Prepare 250mL of 2.00M CuSO4 from CuSO4 x 5H2O
You want how many moles of CuSO4?
M x L = moles = 2.000 x 0.250 L = ??
How many grams CuSO4 is that?
moles = grams/molar mass and solve for grams CuSO4 = xx grams CuSO4.
BUT you don't have CuSO4. You have CuSO4.5H2O so convert xx g CuSO4 to zz grams CuSO4.5H2O.
That will be done easily by
[xx g CuSO4 x (molar mass CuSO4.5H2O/molar mass CuSO4)] = ?? and weigh out that many grams of CuSO4.5H2O. Place in a 250 mL volumetric flask, add enough water to dissolve all of the solid, add water to the mark, shake until the solution is thoroughly mixed.
To prepare 250 mL of a 2.00 M CuSO4 solution from CuSO4 x 5H2O, we need to calculate the amount of CuSO4 x 5H2O needed and then make the solution.
Step 1: Determine the molar mass of CuSO4 x 5H2O.
CuSO4: Copper (Cu) has a molar mass of 63.55 g/mol, sulfur (S) has a molar mass of 32.07 g/mol, and four oxygen (O) atoms have a molar mass of 16.00 g/mol each.
5H2O: Five water (H2O) molecules have a molar mass of 18.02 g/mol each.
Calculating the molar mass of CuSO4 x 5H2O:
(63.55 g/mol Cu) + (32.07 g/mol S) + (4 * 16.00 g/mol O) + (5 * 18.02 g/mol H2O)
= 249.68 g/mol
The molar mass of CuSO4 x 5H2O is 249.68 g/mol.
Step 2: Calculate the amount of CuSO4 x 5H2O needed.
To prepare a 2.00 M solution, we need 2.00 moles of CuSO4 x 5H2O per 1 liter.
Using the equation: Moles = Molarity * Volume (in liters)
Moles = 2.00 M * 0.250 L
Moles = 0.500 mol
Now, use the molar mass of CuSO4 x 5H2O to calculate the mass needed:
Mass = Moles * Molar mass
Mass = 0.500 mol * 249.68 g/mol
Mass = 124.84 g
You will need 124.84 grams of CuSO4 x 5H2O to prepare a 250 mL solution of 2.00 M CuSO4.
Step 3: Prepare the solution.
Measure 124.84 grams of CuSO4 x 5H2O and transfer it to a 250 mL volumetric flask. Add distilled water gradually while swirling until the solution reaches the mark on the flask. Ensure that all the solid is dissolved. Alternatively, you can use a beaker or flask to dissolve the solid in a smaller volume of water and then transfer it to the volumetric flask.
Once all the solid is dissolved and the solution is thoroughly mixed, your 250 mL, 2.00 M CuSO4 solution is ready.