Stock Solution To Working Solution Calculator

Stock Solution Formula:

\[ V_{stock} = \frac{C_{working} \times V_{working}}{C_{stock}} \]

Working Concentration (C_working):

Working Volume (V_working):

Stock Concentration (C_stock):

Stock Volume (V_stock):

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1. What is the Stock Solution Formula?

The stock solution formula calculates the volume of stock solution needed to prepare a specific volume of working solution at a desired concentration. This is a fundamental calculation in laboratory work and chemical preparation.

2. How Does the Calculator Work?

The calculator uses the dilution formula:

\[ V_{stock} = \frac{C_{working} \times V_{working}}{C_{stock}} \]

Where:

\( V_{stock} \) — Volume of stock solution needed (mL)
\( C_{working} \) — Concentration of working solution (M)
\( V_{working} \) — Volume of working solution needed (mL)
\( C_{stock} \) — Concentration of stock solution (M)

Explanation: This formula is derived from the principle of conservation of mass, where the amount of solute remains constant during dilution.

3. Importance of Stock Solution Calculation

Details: Accurate calculation of stock solution volumes is crucial for preparing solutions with precise concentrations, ensuring experimental reproducibility, and maintaining consistency in laboratory procedures.

4. Using the Calculator

Tips: Enter working concentration in M, working volume in mL, and stock concentration in M. All values must be positive numbers greater than zero.

5. Frequently Asked Questions (FAQ)

Q1: What units should I use for concentration?
A: The calculator uses molarity (M) for concentration, but you can use any consistent concentration units as long as they match for both working and stock solutions.

Q2: Can I use this for non-molar concentration units?
A: Yes, as long as the units are consistent (e.g., both in mM, μg/mL, etc.), the calculation will be accurate.

Q3: What if my stock concentration is lower than my desired working concentration?
A: The formula requires that the stock concentration be higher than or equal to the working concentration. If stock concentration is lower, you cannot concentrate the solution using this method.

Q4: How precise should my measurements be?
A: The precision depends on your application. For most laboratory work, measurements should be made with appropriate precision glassware and analytical balances.

Q5: Can this formula be used for serial dilutions?
A: Yes, this formula is the basis for preparing any dilution, including serial dilutions, though multiple calculations may be needed for serial dilution series.