how would ypu prepare 80.00mL of a 7.5% solution of MgSO4 7H2O using solid MgSO4 7H2O and water?
7.5 percent w/v?
.075(80)= 6 grams MgSO4 = 6/120=.05 moles
but moles of the hydrated salt will have a mass of .05*246.5=12.32 grams.
So add 12.32 grams of the salt, and add water while stirring to the 80ml mark.
Now if the .075 is w/w, it is a different issue.
To prepare a 7.5% solution of MgSO4 · 7H2O using solid MgSO4 · 7H2O and water, you will need to calculate the amount of MgSO4 · 7H2O needed and then dissolve it in water to obtain a final volume of 80.00 mL. Here's how you can do it:
1. Start by converting the percent concentration into a decimal. In this case, 7.5% is equivalent to 0.075 (7.5 ÷ 100 = 0.075).
2. Calculate the amount (in grams) of MgSO4 · 7H2O needed. This can be done using the formula:
Mass of solute (g) = Percent concentration (decimal) × Volume of solution (mL)
Mass of solute (g) = 0.075 × 80.00 mL
Mass of solute (g) = 6.00 grams
Therefore, you will need 6.00 grams of MgSO4 · 7H2O.
3. Weigh out 6.00 grams of solid MgSO4 · 7H2O using a balance.
4. Transfer the solid MgSO4 · 7H2O into a clean container or beaker.
5. Add enough water to the container to reach a final volume of 80.00 mL. You may use a graduated cylinder or a measuring pipette to measure the appropriate amount of water accurately.
6. Stir the mixture well to ensure the solid MgSO4 · 7H2O is fully dissolved in the water.
7. Once the solid has completely dissolved, the 7.5% solution of MgSO4 · 7H2O is ready to be used or stored as needed.
Remember to always follow proper lab safety procedures and guidelines when handling chemicals and using equipment.
To prepare 80.00 mL of a 7.5% solution of MgSO4 7H2O, you will need solid MgSO4 7H2O and water. Here's how you can do it step-by-step:
Step 1: Determine the amount of MgSO4 7H2O needed:
To calculate the mass of the MgSO4 7H2O required, you need to use the concentration and the desired volume of the final solution.
Mass of MgSO4 7H2O (g) = (Volume of solution (mL) x Concentration (%)) / 100
= (80.00 mL x 7.5%) / 100
Step 2: Calculate the mass of MgSO4 7H2O:
Use the molar mass of MgSO4 7H2O to convert the desired mass to grams.
Molar mass of MgSO4 7H2O = (24.31 g/mol (Mg) + 32.06 g/mol (S) + 4 * 16.00 g/mol (O)) + 7 * (2 * 1.01 g/mol (H) + 16.00 g/mol (O))
Step 3: Prepare the solution:
a. Weigh out the required mass of MgSO4 7H2O on a balance that can measure accurately.
b. Transfer the weighed MgSO4 7H2O into a suitable container.
c. Add distilled water to the container while stirring gently until the volume reaches 80.00 mL.
Remember to use appropriate safety precautions, such as wearing gloves and eye protection when handling chemicals.