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Molarity to % w/v Formula:
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The conversion from molarity to percent concentration (% w/v) allows chemists and laboratory professionals to express solution concentrations in different units. % w/v represents the mass of solute in grams per 100 mL of solution.
The calculator uses the conversion formula:
Where:
Explanation: The formula converts moles per liter to grams per 100 mL, considering the molecular weight of the solute.
Details: Different scientific contexts require different concentration units. Pharmaceutical preparations often use % w/v, while chemical reactions typically use molarity. This conversion is essential for accurate formulation and dosing.
Tips: Enter molarity in mol/L and molar mass in g/mol. Both values must be positive numbers. The calculator will provide the equivalent concentration in % w/v (grams per 100 mL).
Q1: What's the difference between % w/v and molarity?
A: % w/v expresses concentration as mass per volume (g/100mL), while molarity expresses it as moles per liter (mol/L).
Q2: When should I use % w/v instead of molarity?
A: % w/v is commonly used in pharmaceutical preparations, clinical solutions, and when the molecular weight of the solute is unknown or irrelevant.
Q3: Can this conversion be used for all solutes?
A: Yes, as long as you know the molar mass of the solute. The formula works for any dissolved substance.
Q4: Why is the factor 100/10 used in the formula?
A: The factor converts from g/L (from molarity × molar mass) to g/100mL, which is the definition of % w/v.
Q5: Is temperature consideration important for this conversion?
A: While the conversion itself is temperature-independent, both molarity and % w/v can be affected by temperature changes due to volume expansion/contraction.