how would a dilution be performed, starting with a concentration .50 M Cacl2 solution, to obtain 250ml of a .060M solution?
To perform a dilution starting with a concentrated solution, you need to add a solvent (typically water) to lower the concentration of the solution. Here are the steps to perform the dilution:
1. Determine the volume of the concentrated solution (V1) needed to obtain the desired final concentration. In this case, you want to obtain a 0.060 M solution, and the final volume required is 250 mL.
2. Use the dilution formula to calculate the volume of the concentrated solution needed:
V1 x C1 = V2 x C2
V1 = (V2 x C2) / C1
Where:
V1 = volume of the concentrated solution
C1 = concentration of the concentrated solution
V2 = desired final volume
C2 = desired final concentration
Plugging the given values into the formula:
V1 = (250 mL x 0.060 M) / 0.50 M
V1 = 30 mL
Therefore, you will need to measure 30 mL of the 0.50 M CaCl2 solution.
3. Add the measured volume of the concentrated solution (30 mL of the 0.50 M CaCl2) to a suitable container or flask.
4. Add enough solvent (usually water) to reach the desired final volume. In this case, add enough water to make the total volume 250 mL.
5. Mix the solution thoroughly to ensure full homogeneity.
By following these steps, you will obtain a 250 mL solution with a final concentration of 0.060 M CaCl2.