The dilution equation C1V1 = C2V2 relates concentrations and volumes before and after diluting a solution.
Formula
C1V1 = C2V2. C is concentration, V is volume. If you know three variables, solve for the fourth. Use the Dilution Calculator.
Lab Example
Prepare 500 mL of 0.1 M solution from 2 M stock: V1 = C2V2/C1 = (0.1)(500)/2 = 25 mL stock plus water to 500 mL.
Safety Note
Always add acid to water, not water to acid. Wear appropriate PPE in the laboratory.
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