I need to be able to describe how to prepare 20 mL of a 0.0050 M KIO3 solution from a stock solution with a concentration of 0.020 M.
To prepare 20 mL of a 0.0050 M KIO3 solution from a stock solution with a concentration of 0.020 M, you need to dilute the stock solution appropriately. Here's how you can do it:
1. Calculate the amount of KIO3 needed:
- Use the formula:
M1 × V1 = M2 × V2
- M1: initial concentration
- V1: initial volume (unknown)
- M2: desired concentration
- V2: final volume
- Substitute the known values:
0.020 M × V1 = 0.0050 M × 20 mL
2. Solve for V1:
- Rearrange the formula:
V1 = (M2 × V2) / M1
- Substitute the known values:
V1 = (0.0050 M × 20 mL) / 0.020 M
- Calculate:
V1 = 10 mL
3. Measure 10 mL of the stock solution using a graduated cylinder or pipette.
4. Transfer the measured stock solution into a container, such as a beaker or flask.
5. Add distilled water to the container to bring the total volume to 20 mL. You can use a graduated cylinder to measure and add the water.
6. Gently mix the solution to ensure proper mixing of KIO3 and water.
Now, you have successfully prepared 20 mL of a 0.0050 M KIO3 solution from a stock solution with a concentration of 0.020 M.