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Molarity from Percentage Formula:
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The molarity from percentage calculation converts a percentage concentration (w/w) to molarity (mol/L) using the solution's density and the solute's molecular weight. This is particularly useful in chemistry when preparing solutions from concentrated stock solutions.
The calculator uses the formula:
Where:
Explanation: The formula accounts for the mass percentage of solute, the density of the solution, and converts units appropriately to arrive at molarity.
Details: Molarity is a fundamental concentration unit in chemistry used for stoichiometric calculations, solution preparation, and quantitative analysis. Converting from percentage to molarity allows for more precise chemical reactions and dilutions.
Tips: Enter the percentage concentration (without % sign), solution density in g/mL, and molecular weight in g/mol. Ensure all values are positive numbers for accurate calculation.
Q1: What's the difference between w/w and w/v percentages?
A: w/w (weight/weight) is mass of solute per mass of solution, while w/v (weight/volume) is mass of solute per volume of solution. This calculator uses w/w percentage.
Q2: Why multiply by 10 in the formula?
A: The factor of 10 converts percentage (parts per hundred) to parts per thousand and adjusts for density units (g/mL to g/L).
Q3: Can I use this for any solute?
A: Yes, as long as you know the molecular weight of the solute and the solution's density at the given percentage.
Q4: How accurate is this calculation?
A: Accuracy depends on the precision of your input values, especially density which can vary with temperature.
Q5: What if my percentage is v/v instead of w/w?
A: For v/v (volume/volume) percentages, you'll need additional information about the densities of both solute and solvent.