Explain how to make a 1.5M solution of copper (II) sulfate with a volume of 250 mL.
Use 1.5/4 moles CuSO4 (moles = grams/molar mass and solve for grams), dissolve in a little water, and make to a final volume of 250 mL.
To make a 1.5M solution of copper (II) sulfate with a volume of 250 mL, you need to follow a specific set of steps. Here's how you can do it:
Step 1: Calculate the amount of copper (II) sulfate needed:
- To find the amount of copper (II) sulfate needed, you need to use the formula: Molarity (M) = Moles (mol) / Volume (L).
- Rearranging the formula, you get: Moles (mol) = Molarity (M) x Volume (L).
- In this case, the desired molarity (M) is 1.5M, and the desired volume (V) is 0.250 L (since 250 mL is equal to 0.250 L).
- Therefore, Moles (mol) = 1.5M x 0.250 L = 0.375 moles.
Step 2: Determine the molar mass of copper (II) sulfate:
- The molar mass of copper (II) sulfate can be obtained from the periodic table and is equal to 159.609 g/mol.
Step 3: Calculate the mass of copper (II) sulfate needed:
- To find the mass of copper (II) sulfate needed, you need to use the formula: Mass (g) = Moles (mol) x Molar mass (g/mol).
- Plugging in the values, you get: Mass (g) = 0.375 mol x 159.609 g/mol = 59.853 g.
Step 4: Prepare the solution:
- Weigh out 59.853 grams of copper (II) sulfate using an analytical balance. Make sure the balance is properly calibrated.
- Add the weighed copper (II) sulfate to a container or volumetric flask.
- Add distilled water to the container or volumetric flask until the total volume reaches 250 mL.
Step 5: Mix the solution:
- Use a stirring rod or magnetic stirrer to mix the contents of the container or volumetric flask until the copper (II) sulfate is completely dissolved.
And there you have it – a 1.5M solution of copper (II) sulfate with a volume of 250 mL.