Stock Solution Dilution
Calculate C1V1 = C2V2 for Reagents & Standards
Note: Ensure concentration units (e.g. mg/mL, M, %) are consistent for C1 and C2.
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Understanding the Dilution Equation (C1V1 = C2V2)
The dilution equation C1V1 = C2V2 is a fundamental concept in pharmaceutical laboratories. It is used to determine how much Stock Solution (concentrated) is needed to prepare a specific volume of a Working Solution (diluted).
Definitions
- C1: Concentration of the starting Stock Solution.
- V1: Volume of Stock Solution to transfer.
- C2: Desired Final Concentration.
- V2: Desired Final Total Volume.
How to Use
Select which variable you want to solve for using the dropdown menu. Enter the three known variables, and the calculator will determine the missing fourth variable.
Key Formula
C1 × V1 = C2 × V2
Ensure units for C1/C2 match (e.g. both in M) and V1/V2 match (e.g. both in mL).