1. What is Molarity?

Molarity (M) is a measure of concentration defined as the number of moles of solute per liter of solution. It's one of the most commonly used units of concentration in chemistry and physiology.

2. How Does the Calculator Work?

The calculator uses the molarity equation:

Where:

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

Explanation: The equation first converts mass to moles by dividing by molecular weight, then divides by volume to get concentration.

3. Importance of Molarity in Physiology

Details: Molarity is crucial for preparing physiological solutions, calculating drug dosages, and understanding osmotic balance in biological systems.

4. Using the Calculator

Tips: Enter mass in grams, molecular weight in g/mol, and volume in liters. All values must be positive numbers.

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.

Q2: How do I find molecular weight?
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 different units?
A: The calculator expects grams and liters. Convert other units first (e.g., mg to g, mL to L).

Q4: Why is molarity important in physiology?
A: Many physiological processes depend on concentration gradients (e.g., nerve impulses, kidney function).

Q5: How precise should my measurements be?
A: For physiological applications, typically 2-3 significant figures are sufficient.