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Molarity Formula:
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Percent concentration (weight/volume %) to molarity conversion is a common calculation in chemistry that allows you to convert between these two different ways of expressing solution concentration. Molarity (mol/L) is often more useful for stoichiometric calculations in chemical reactions.
The calculator uses the following formula:
Where:
Explanation: The formula accounts for the mass of solute per volume of solution and converts it to moles per liter using the molecular weight.
Details: Molarity is a fundamental unit in chemistry for preparing solutions, performing dilutions, and calculating reaction stoichiometry. Converting from percent concentration is essential when precise molar quantities are needed.
Tips: Enter percent concentration (%), solution density (g/mL), and molecular weight (g/mol). All values must be positive numbers. For aqueous solutions at room temperature, density is approximately 1 g/mL.
Q1: What's the difference between % w/v and % w/w?
A: % w/v is weight per volume (g solute/100 mL solution), while % w/w is weight per weight (g solute/100 g solution). This calculator uses % w/v.
Q2: When is density important in this conversion?
A: Density is crucial for non-aqueous solutions or concentrated solutions where density differs significantly from 1 g/mL.
Q3: Can I use this for very dilute solutions?
A: Yes, but for very dilute solutions (<0.1%), molarity may be more conveniently expressed in mM or µM units.
Q4: How accurate is this conversion?
A: Accuracy depends on the precision of your input values, especially the density measurement for non-aqueous solutions.
Q5: What if I only know % w/w concentration?
A: You would need to know the solution density to convert % w/w to % w/v first, then use this calculator.