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Molarity Formula:
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Molarity (M) is a unit of concentration representing the number of moles of solute per liter of solution. It's one of the most common ways to express concentration in chemistry.
The calculator uses the molarity formula:
Where:
Explanation: The formula converts the mass of solute to moles (using molecular weight) and divides by the volume of solution to get concentration.
Details: Accurate molarity calculations are essential for preparing solutions in laboratories, chemical reactions, and various scientific experiments where precise concentrations are required.
Tips: Enter mass in grams, molecular weight in g/mol, and volume in liters. All values must be positive numbers. The calculator will compute the molarity in mol/L.
Q1: What's the difference between molarity and molality?
A: Molarity is moles per liter of solution, while molality is moles per kilogram of solvent. Molarity is temperature-dependent (volume changes with temperature), while molality is not.
Q2: How do I find the molecular weight of a compound?
A: Molecular weight is the sum of atomic weights of all atoms in the molecule. You can find it on the compound's safety data sheet or calculate it from the chemical formula.
Q3: Can I use different units with this calculator?
A: This calculator uses grams for mass and liters for volume. Convert other units before entering values (e.g., mg to g, mL to L).
Q4: Why is my calculated molarity different from expected?
A: Possible reasons include incorrect molecular weight, incomplete dissolution of solute, or volume measurement errors.
Q5: How precise should my measurements be?
A: Precision depends on your needs. For most lab work, measure mass to at least 3-4 significant figures and volume with calibrated glassware.