1. What is Molarity?

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's a fundamental concept in chemistry and physiology for preparing solutions with precise concentrations.

2. How Does the Calculator Work?

The calculator uses the molarity formula:

Where:

• \( M \) — Molarity (mol/L)
• \( m \) — Mass of solute (g)
• \( MW \) — Molecular weight of solute (g/mol)
• \( V \) — Volume of solution (L)

Explanation: The formula calculates how many moles of solute are present in each liter of solution.

3. Importance of Molarity Calculation

Details: Accurate molarity calculations are essential for preparing solutions in laboratory experiments, medical treatments, and physiological studies. Precise concentrations ensure reproducible results in scientific research.

4. Using the Calculator

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.

5. Frequently Asked Questions (FAQ)

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 changes with temperature, molality doesn't.

Q2: How do I find the molecular weight of a compound?
A: Sum the atomic weights of all atoms in the molecule. For example, NaCl = 22.99 (Na) + 35.45 (Cl) = 58.44 g/mol.

Q3: Can I use milliliters for volume?
A: Yes, but convert to liters first (divide by 1000) since molarity uses liters in its definition.

Q4: Why is molarity important in physiology?
A: Physiological processes depend on specific concentrations of ions and molecules. For example, normal saline is 0.9% NaCl (≈0.154 M).

Q5: How precise should my measurements be?
A: Precision depends on application. For most physiological work, 3-4 significant figures are sufficient.