describe how you would make a 2.5L of a .100M KCL solution from a 5.5M stock solution
2.5 l of 0.1M solution contains 0.25 moles.
Volume of 5.5M stock solution required
= 0.25/5.5 * 1000 ml
45.454545
To make a 2.5L of a 0.100M KCl solution from a 5.5M stock solution, you'll need to dilute the stock solution by adding an appropriate amount of solvent (water) to achieve the desired concentration. Here's how you can do it step-by-step:
Step 1: Calculate the amount of KCl needed:
Use the formula:
C1V1 = C2V2
where,
C1 = concentration of stock solution (5.5M)
V1 = volume of stock solution (unknown)
C2 = final concentration of the solution (0.100M)
V2 = final volume of the solution (2.5L)
Substituting the values:
(5.5M)(V1) = (0.100M)(2.5L)
Solve for V1:
V1 = (0.100M)(2.5L) / 5.5M
V1 ≈ 0.0455L
Therefore, you'll need approximately 0.0455L (or 45.5mL) of the stock solution.
Step 2: Calculate the volume of water needed:
To make a total volume of 2.5L, you'll need to add water to the stock solution.
Volume of water = V2 - V1
Volume of water = 2.5L - 0.0455L
Volume of water ≈ 2.455L
Therefore, you'll need approximately 2.455L (or 2455mL) of water.
Step 3: Mix stock solution with water:
Add the calculated volumes of stock solution (45.5mL) and water (2455mL) into a container. Pour the stock solution into the container first, followed by the water. Mix them thoroughly to ensure proper dilution.
Step 4: Adjust the final volume:
Check the final volume and adjust if necessary, making sure it reaches exactly 2.5L.
And that's it! You have successfully prepared a 2.5L of a 0.100M KCl solution from a 5.5M stock solution.
To make a 2.5L of a 0.100M KCl (potassium chloride) solution from a 5.5M stock solution, you will need to dilute the stock solution by adding an appropriate amount of solvent (usually water). Here's how you can calculate the required amounts:
Step 1: Determine the desired final volume of the solution.
In this case, the final volume is given as 2.5L.
Step 2: Calculate the amount of solute needed from the stock solution.
Use the formula: C1V1 = C2V2, where
C1 = concentration of the stock solution
V1 = volume of the stock solution used
C2 = desired concentration of the final solution
V2 = desired final volume of the solution
Given:
C1 = 5.5M (concentration of the stock solution)
V2 = 2.5L (desired final volume of the solution)
C2 = 0.100M (desired concentration of the final solution)
Rearranging the formula:
V1 = (C2 * V2) / C1
Plugging in the values:
V1 = (0.100M * 2.5L) / 5.5M
Step 3: Calculate the amount of solvent needed to reach the desired final volume.
The amount of solvent needed can be determined by subtracting the volume of the stock solution from the final volume.
Solvent volume = V2 - V1
Plugging in the values:
Solvent volume = 2.5L - V1
Now, calculate V1:
V1 = (0.100M * 2.5L) / 5.5M
V1 = 0.04545454545 L ≈ 45.45 mL
Finally, calculate the solvent volume:
Solvent volume = 2.5L - 45.45 mL
Solvent volume = 2.45455 L ≈ 2454.55 mL
Therefore, to make a 2.5L of a 0.100M KCl solution from a 5.5M stock solution, you will need to measure out approximately 45.45 mL of the stock solution and add approximately 2454.55 mL of solvent (water) to reach the desired final volume.