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What Volume of 0.250 M KCl Is Needed to Make 100.0 mL of 0.100 M Solution?
Introduction:
In chemistry, solutions are made by dissolving a solute in a solvent. The concentration of a solution is an important factor that determines its properties and behavior. Calculating the volume of a certain concentration of solute needed to make a desired concentration of solution is a common task in the laboratory. In this article, we will discuss how to calculate the volume of a 0.250 M KCl solution required to make a 100.0 mL of 0.100 M KCl solution.
Procedure:
To determine the volume of a 0.250 M KCl solution needed, we can use the formula:
C1V1 = C2V2
Where C1 represents the initial concentration, V1 represents the initial volume, C2 represents the final concentration, and V2 represents the final volume. Let’s calculate the volume of 0.250 M KCl solution needed to make 100.0 mL of 0.100 M KCl solution using this formula.
Step 1: Write down the known values:
C1 = 0.250 M (initial concentration)
C2 = 0.100 M (final concentration)
V1 = unknown volume (volume of the 0.250 M KCl solution needed)
V2 = 100.0 mL (final volume)
Step 2: Plug the values into the formula:
0.250 M * V1 = 0.100 M * 100.0 mL
Step 3: Solve for V1:
V1 = (0.100 M * 100.0 mL) / 0.250 M
V1 = 40.0 mL
Therefore, to make a 100.0 mL of 0.100 M KCl solution, you will need 40.0 mL of 0.250 M KCl solution.
FAQs:
Q: What does the concentration of a solution represent?
A: The concentration of a solution represents the amount of solute present in a given volume of solvent. It is usually expressed in moles per liter (M).
Q: How can I calculate the volume of a solution needed to make a desired concentration?
A: You can use the formula C1V1 = C2V2, where C1 and V1 represent the initial concentration and volume, and C2 and V2 represent the final concentration and volume.
Q: Why is it important to accurately measure the concentration of a solution?
A: Accurate measurement of the concentration is crucial because it determines the properties and behavior of the solution, including its chemical reactions, physical properties, and potential toxicity.
Q: Can I use any unit of concentration in the formula?
A: The units of concentration in the formula must be consistent. If you use moles per liter (M) for one concentration, you should use the same unit for the other concentration.
Q: Can I use this formula for any solute-solvent combination?
A: Yes, the formula is applicable to any solute-solvent combination as long as the units of concentration are consistent.
Conclusion:
Calculating the volume of a specific concentration of solute needed to make a desired concentration of solution is an essential task in chemistry. By using the formula C1V1 = C2V2, we can determine the volume of a 0.250 M KCl solution required to make a 100.0 mL of 0.100 M KCl solution, which in this case is 40.0 mL. Accurate measurement of concentration is crucial in order to ensure the desired properties and behavior of the final solution.
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