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Stock Solution Concentration Formula:
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Stock solution concentration refers to the amount of solute dissolved in a given volume of solvent. It's typically expressed in mass per unit volume (g/L) or molarity (mol/L). Stock solutions are concentrated solutions that are later diluted to working concentrations.
The calculator uses the basic concentration formula:
Where:
For molarity calculation (if molecular weight is provided):
Where:
Details: Accurate stock solution preparation is fundamental in chemistry and biology experiments. Proper concentrations ensure reproducibility and accuracy in downstream applications.
Tips: Enter the mass of solute in grams and volume of solution in liters. For molarity calculation, provide the molecular weight. Use precise measurements for accurate results.
Q1: What's the difference between stock solution and working solution?
A: Stock solutions are concentrated solutions that are stored and later diluted to create working solutions of desired concentrations.
Q2: Why express concentration in g/L and molarity?
A: g/L is useful for general preparation while molarity (mol/L) is essential for stoichiometric calculations in reactions.
Q3: How should I measure the solute accurately?
A: Use an analytical balance for precise measurement of solids. For liquids, use the density if measuring by volume.
Q4: Does temperature affect concentration?
A: Volume can change with temperature, so for precise work, measure at the temperature you'll be using the solution or standardize at 20°C.
Q5: How should stock solutions be stored?
A: Store in appropriate containers (glass/plastic), label clearly with concentration, date, and contents. Some may require refrigeration or protection from light.