Question

How much water (in ml) should you add to 0.070 moles of na2so4 to make a 0.20 m solution?

Answer 1

To make a 0.20 M Na2SO4 solution with 0.070 moles of solute, you would need to add water to achieve a total volume of 350 mL.

Step-by-step explanation:

To make a 0.20 M solution of Na2SO4, we need to first calculate the volume of water necessary to dissolve 0.070 moles of Na2SO4 to achieve the desired molarity. Molarity is defined as moles of solute per liter of solution (moles/L).

Step-by-Step Solution:

1. Determine the desired molarity of the solution, which is 0.20 M.
2. Calculate the volume of solution needed using the formula: Volume = Moles / Molarity. Here, we plug in the given values: Volume = 0.070 moles / 0.20 M.
3. Perform the division to find the volume: Volume = 0.35 L.
4. Since 1 L = 1000 mL, convert this volume to milliliters: Volume = 0.35 L × 1000 mL/L.
5. Finally, calculate the volume in milliliters: Volume = 350 mL.

Therefore, to prepare a 0.20 M solution, you would need to add water to a volume of 350 mL after having dissolved 0.070 moles of Na2SO4.