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Molarity Formula:
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Molarity (M) is a measure of the concentration of a solute in a solution, defined as the number of moles of solute per liter of solution. It is one of the most commonly used units of concentration in chemistry and physiology.
The calculator uses the molarity formula:
Where:
Explanation: This formula converts mass concentration to molar concentration by dividing by the molecular weight of the substance.
Details: Accurate molarity calculation is essential for preparing solutions with precise concentrations, conducting chemical reactions, and understanding physiological processes where concentration affects biological function.
Tips: Enter concentration in g/L and molecular weight in g/mol. Both values must be positive numbers greater than zero.
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, while molality is not.
Q2: Why is molarity important in physiology?
A: Molarity helps determine the concentration of substances like electrolytes, hormones, and drugs in biological fluids, which is crucial for understanding their physiological effects.
Q3: How do I convert between different concentration units?
A: Conversions require knowing the molecular weight and density of the solution. For dilute aqueous solutions, molarity and molality are approximately equal.
Q4: What are typical molarity ranges in physiological systems?
A: Physiological concentrations range from millimolar (mM) for electrolytes to nanomolar (nM) for hormones and micromolar (μM) for many metabolites.
Q5: When should I use this calculator?
A: Use this calculator when you need to convert between mass concentration (g/L) and molar concentration (mol/L) for any chemical substance.